v5 v6: wrappers round require

54 files changed, 516 insertions, 148 deletions

diff --git a/data/doc/sisu/CHANGELOG_v5 b/data/doc/sisu/CHANGELOG_v5
index 8e3bafe6..c44bb54b 100644
--- a/data/doc/sisu/CHANGELOG_v5
+++ b/data/doc/sisu/CHANGELOG_v5
@@ -38,6 +38,8 @@ http://www.jus.uio.no/sisu/pkg/src/sisu_5.3.1.orig.tar.xz
   sisu_5.3.1.orig.tar.xz
   sisu_5.3.1-1.dsc
 
+* wrappers round require
+
 %% 5.3.0.orig.tar.xz (2014-01-26:03/7)
 http://sources.sisudoc.org/gitweb/?p=code/sisu.git;a=shortlog;h=refs/tags/sisu_5.3.0
 http://sources.sisudoc.org/gitweb/?p=code/sisu.git;a=shortlog;h=refs/tags/debian/sisu_5.3.0-1
diff --git a/data/doc/sisu/CHANGELOG_v6 b/data/doc/sisu/CHANGELOG_v6
index 0cef8ddb..0f5eff45 100644
--- a/data/doc/sisu/CHANGELOG_v6
+++ b/data/doc/sisu/CHANGELOG_v6
@@ -28,6 +28,8 @@ http://www.jus.uio.no/sisu/pkg/src/sisu_6.0.1.orig.tar.xz
   sisu_6.0.1.orig.tar.xz
   sisu_6.0.1-1.dsc
 
+* wrappers round require
+
 %% 6.0.0.orig.tar.xz (2014-01-26:03/7)
 http://sources.sisudoc.org/gitweb/?p=code/sisu.git;a=shortlog;h=refs/tags/sisu_6.0.0
 http://sources.sisudoc.org/gitweb/?p=code/sisu.git;a=shortlog;h=refs/tags/debian/sisu_6.0.0-1
diff --git a/lib/sisu/v5/ao_hash_digest.rb b/lib/sisu/v5/ao_hash_digest.rb
index 585ff659..3f372893 100644
--- a/lib/sisu/v5/ao_hash_digest.rb
+++ b/lib/sisu/v5/ao_hash_digest.rb
@@ -75,7 +75,11 @@ module SiSU_AO_Hash
       data=@data.compact
       @tuned_file=[]
       sha_ =(@env.digest.type=='sha256' ? true : false)
-      sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+      begin
+        sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+      rescue LoadError
+        SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error((sha_ ? 'digest/sha2' : 'digest/md5') + ' NOT FOUND')
+      end
       data.each do |t_o|
         unless t_o.obj.is_a?(Array)
           t_o.obj=t_o.obj.strip
diff --git a/lib/sisu/v5/ao_images.rb b/lib/sisu/v5/ao_images.rb
index ab42034d..d01c98b8 100644
--- a/lib/sisu/v5/ao_images.rb
+++ b/lib/sisu/v5/ao_images.rb
@@ -62,8 +62,12 @@
 =end
 module SiSU_AO_Images
   class Images
-    #require 'RMagick'
-    #include Magick
+    #begin
+    #  require 'RMagick'
+    #  include Magick
+    #rescue LoadError
+    #  SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('RMagic NOT FOUND (LoadError)')
+    #end
     def initialize(md,data)
       @md,@data=md,data
     end
diff --git a/lib/sisu/v5/cgi_pgsql.rb b/lib/sisu/v5/cgi_pgsql.rb
index 33e43b46..0a514672 100644
--- a/lib/sisu/v5/cgi_pgsql.rb
+++ b/lib/sisu/v5/cgi_pgsql.rb
@@ -192,9 +192,13 @@ module  SiSU_CGI_PgSQL
  * Description: generates naive cgi search form for search of sisu database (pgsql)
 #{gpl}
 =end
-      require 'cgi'
-      require 'fcgi'
-      require 'dbi'
+      begin
+        require 'cgi'
+        require 'fcgi'
+        require 'dbi'
+      rescue LoadError
+        puts 'cgi, fcgi or dbi NOT FOUND (LoadError)'
+      end
       @stub_default='#{@name_of[:db]}'
       @image_src='#{@image_src}'
       @hosturl_cgi='#{@name_of[:host_url_cgi]}'
diff --git a/lib/sisu/v5/cgi_sqlite.rb b/lib/sisu/v5/cgi_sqlite.rb
index 8ebe0c16..aa38e6f1 100644
--- a/lib/sisu/v5/cgi_sqlite.rb
+++ b/lib/sisu/v5/cgi_sqlite.rb
@@ -165,9 +165,13 @@ module  SiSU_CGI_SQLite
  * Description: generates naive cgi search form for search of sisu database (sqlite)
 #{gpl}
 =end
-      require 'cgi'
-      require 'fcgi'
-      require 'dbi'
+      begin
+        require 'cgi'
+        require 'fcgi'
+        require 'dbi'
+      rescue LoadError
+        puts 'cgi, fcgi or dbi NOT FOUND (LoadError)'
+      end
       @stub_default='sisu_sqlite'
       @image_src='#{@image_src}'
       @hosturl_cgi='#{@env.url.webserv_base_cgi(@opt)}/cgi-bin'
diff --git a/lib/sisu/v5/composite.rb b/lib/sisu/v5/composite.rb
index c1457779..9e7ccb5c 100644
--- a/lib/sisu/v5/composite.rb
+++ b/lib/sisu/v5/composite.rb
@@ -178,10 +178,14 @@ module SiSU_Assemble
           end
           tuned_file << if loadfile =~ /(?:https?|file):\/\/\S+?\.ss[ti]$/ # and NetTest
             imagedir = /((?:https?|file):\/\/\S+?)\/[^\/]+?\.ss[ti]$/.match(loadfile).captures.join + '/_sisu/image' #watch
-            require 'uri'
+            begin
+              require 'uri'
+              require 'open-uri'
+              require 'pp'
+            rescue LoadError
+              SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('uri, open-uri or pp NOT FOUND (LoadError)')
+            end
             image_uri=URI.parse(imagedir)
-            require 'open-uri'
-            require 'pp'
             insert=open(loadfile)
             insert_array=insert.dup
             insert.close
diff --git a/lib/sisu/v5/db_import.rb b/lib/sisu/v5/db_import.rb
index 8d9fc229..0dc5a29b 100644
--- a/lib/sisu/v5/db_import.rb
+++ b/lib/sisu/v5/db_import.rb
@@ -66,7 +66,6 @@ module SiSU_DbImport
   require_relative 'db_load_tuple'                      # db_load_tuple.rb
   require_relative 'db_sqltxt'                          # db_sqltxt.rb
   require_relative 'html_lite_shared'                   # html_lite_shared.rb
-  require 'sqlite3'
   class Import < SiSU_DbText::Prepare
     include SiSU_Param
     include SiSU_Screen
diff --git a/lib/sisu/v5/dbi.rb b/lib/sisu/v5/dbi.rb
index d92f1964..1ab9bc9c 100644
--- a/lib/sisu/v5/dbi.rb
+++ b/lib/sisu/v5/dbi.rb
@@ -120,9 +120,12 @@ manually create the database: "#{cX.green}#{@db.db}#{cX.off}" if it does not yet
     end
     def read_sqlite
       begin
-        @conn=@db.sqlite.conn_sqlite3
-      rescue
-      ensure
+        begin
+          require 'sqlite3'
+          @conn=@db.sqlite.conn_sqlite3
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('sqlite3 NOT FOUND (LoadError)')
+        end
       end
     end
     def connect
diff --git a/lib/sisu/v5/dbi_discrete.rb b/lib/sisu/v5/dbi_discrete.rb
index 0981455c..cd8c7de1 100644
--- a/lib/sisu/v5/dbi_discrete.rb
+++ b/lib/sisu/v5/dbi_discrete.rb
@@ -69,8 +69,12 @@ module  SiSU_DBI_Discrete                               #% database building
     include SiSU_DbDBI
   require_relative 'html_lite_shared'                   # html_lite_shared.rb
     include SiSU_FormatShared
-  require 'fileutils'
-    include FileUtils::Verbose
+  begin
+    require 'fileutils'
+      include FileUtils::Verbose
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('fileutils NOT FOUND (LoadError)')
+  end
   class SQL
     def initialize(opt)
       SiSU_Env::Load.new('dbi',true).prog
@@ -145,9 +149,12 @@ module  SiSU_DBI_Discrete                               #% database building
     end
     def read_sqlite
       begin
-        @conn=@db.sqlite.conn_sqlite3
-      rescue
-      ensure
+        begin
+          require 'sqlite3'
+          @conn=@db.sqlite.conn_sqlite3
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('sqlite3 not available')
+        end
       end
     end
     def connect
diff --git a/lib/sisu/v5/defaults.rb b/lib/sisu/v5/defaults.rb
index fd56c2c4..25dd270a 100644
--- a/lib/sisu/v5/defaults.rb
+++ b/lib/sisu/v5/defaults.rb
@@ -62,7 +62,11 @@
 =end
 $latex_run=nil
 module SiSU_Viz
-  require 'uri'
+  begin
+    require 'uri'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('uri NOT FOUND (LoadError)')
+  end
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   require_relative 'css'                                # css.rb
diff --git a/lib/sisu/v5/html.rb b/lib/sisu/v5/html.rb
index f473f1b7..1b738561 100644
--- a/lib/sisu/v5/html.rb
+++ b/lib/sisu/v5/html.rb
@@ -61,7 +61,11 @@
 
 =end
 module SiSU_HTML
-  require 'pstore'
+  begin
+    require 'pstore'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pstore NOT FOUND (LoadError)')
+  end
   require_relative 'particulars'                        # particulars.rb
     include SiSU_Particulars
   require_relative 'defaults'                           # defaults.rb
diff --git a/lib/sisu/v5/hub.rb b/lib/sisu/v5/hub.rb
index d0393a3b..b7d62a38 100644
--- a/lib/sisu/v5/hub.rb
+++ b/lib/sisu/v5/hub.rb
@@ -72,7 +72,11 @@ module SiSU
   require_relative 'defaults'                          # defaults.rb
     include SiSU_Viz
   require_relative 'utils'                             # utils.rb
-  require 'uri'
+  begin
+    require 'uri'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('uri NOT FOUND (LoadError)')
+  end
   class HubMaster
     def initialize(argv)
       pwd_the=Dir.pwd
@@ -246,8 +250,12 @@ module SiSU
     end
   end
   class Processing
-    require 'fileutils'
-      include FileUtils
+    begin
+      require 'fileutils'
+        include FileUtils
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('fileutils NOT FOUND (LoadError)')
+    end
     @@env=nil
     attr_accessor :op
     def initialize(opt)
@@ -645,7 +653,11 @@ module SiSU
     end
     def actions
       if @opt.act[:profile][:set]==:on
-        require 'profile'
+        begin
+          require 'profile'
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('profile NOT FOUND (LoadError)')
+        end
       end
       action_on_file_ =if @opt.act[:rsync][:set]==:on \
       && @opt.act[:site_init][:set]==:on
diff --git a/lib/sisu/v5/options.rb b/lib/sisu/v5/options.rb
index 65af15b4..112a7a09 100644
--- a/lib/sisu/v5/options.rb
+++ b/lib/sisu/v5/options.rb
@@ -62,7 +62,11 @@
 
 =end
 module SiSU_Commandline
-  require 'pathname'
+  begin
+    require 'pathname'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pathname NOT FOUND (LoadError)')
+  end
   require_relative 'sysenv'                             # sysenv.rb
   require_relative 'param_make'                         # param_make.rb
   @@sisu_call_origin_path=nil
diff --git a/lib/sisu/v5/param.rb b/lib/sisu/v5/param.rb
index e8eb3fc6..ad29ff92 100644
--- a/lib/sisu/v5/param.rb
+++ b/lib/sisu/v5/param.rb
@@ -61,8 +61,12 @@
 
 =end
 module SiSU_Param
-  require 'uri'
-  require 'pstore'
+  begin
+    require 'uri'
+    require 'pstore'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('uri or pstore NOT FOUND (LoadError)')
+  end
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   require_relative 'param_make'                         # param_make.rb
diff --git a/lib/sisu/v5/particulars.rb b/lib/sisu/v5/particulars.rb
index 0687150a..6efbc94c 100644
--- a/lib/sisu/v5/particulars.rb
+++ b/lib/sisu/v5/particulars.rb
@@ -62,7 +62,11 @@
 
 =end
 module SiSU_Particulars
-  require 'singleton'
+  begin
+    require 'singleton'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('singleton NOT FOUND (LoadError)')
+  end
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   require_relative 'param'                              # param.rb
diff --git a/lib/sisu/v5/remote.rb b/lib/sisu/v5/remote.rb
index 145ec9b2..e06e7b33 100644
--- a/lib/sisu/v5/remote.rb
+++ b/lib/sisu/v5/remote.rb
@@ -112,8 +112,12 @@ module SiSU_Remote
       @tell=lambda { SiSU_Screen::Ansi.new(@opt.act[:color_state][:set],@msg,"#{@msgs.inspect if @msgs}") }
     end
     def fns
-      require 'open-uri'
-      require 'pp'
+      begin
+        require 'open-uri'
+        require 'pp'
+      rescue LoadError
+        SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('open-uri or pp NOT FOUND (LoadError)')
+      end
       require_relative 'composite'                      # composite.rb
       @rgx_image=/(?:^|[^_\\])\{\s*(\S+?\.(?:png|jpg|gif))/
       threads=[]
@@ -158,7 +162,11 @@ module SiSU_Remote
     def sisupod
       get_p=@get_s
       if get_p.length > 0                                     #% remote sisupod
-         require 'net/http'
+        begin
+          require 'net/http'
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('net/http NOT FOUND (LoadError)')
+        end
         for requested_pod in get_p
           pod_info=RemoteDownload.new(requested_pod)
           Net::HTTP.start(pod_info.pod.site) do |http|
diff --git a/lib/sisu/v5/rexml.rb b/lib/sisu/v5/rexml.rb
index c00797a3..bc9f7541 100644
--- a/lib/sisu/v5/rexml.rb
+++ b/lib/sisu/v5/rexml.rb
@@ -62,14 +62,22 @@
 =end
 module SiSU_Rexml
   # load XML file for REXML parsing
-  require 'rexml/document' if FileTest.directory?("#{Config::CONFIG['rubylibdir']}/rexml") #Config::CONFIG['sitedir']
+  begin
+    require 'rexml/document' if FileTest.directory?("#{Config::CONFIG['rubylibdir']}/rexml") #Config::CONFIG['sitedir']
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rexml/document NOT FOUND (LoadError)')
+  end
   require_relative 'param'                              # param.rb
     include SiSU_Param
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   include SiSU_Viz
   class Rexml
-    require 'rexml/document' if FileTest.directory?("#{Config::CONFIG['rubylibdir']}/rexml") #Config::CONFIG['sitedir']
+    begin
+      require 'rexml/document' if FileTest.directory?("#{Config::CONFIG['rubylibdir']}/rexml") #Config::CONFIG['sitedir']
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rexml/document NOT FOUND (LoadError)')
+    end
     def initialize(md,fno)
       @md,@fno=md,fno
       @env=SiSU_Env::InfoEnv.new(@md.fns)
diff --git a/lib/sisu/v5/shared_markup_alt.rb b/lib/sisu/v5/shared_markup_alt.rb
index 4a1959e8..5a37c934 100644
--- a/lib/sisu/v5/shared_markup_alt.rb
+++ b/lib/sisu/v5/shared_markup_alt.rb
@@ -208,7 +208,11 @@ module SiSU_TextRepresentation
       end
       @env ||=SiSU_Env::InfoEnv.new(@md.fns)
       @sha_ =((@env.digest.type =='sha256') ? true : false)
-      @sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+      begin
+        @sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+      rescue LoadError
+        SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error((@sha_ ? 'digest/sha2' : 'digest/md5') + ' NOT FOUND')
+      end
     end
     def digest(txt)
       d=nil
diff --git a/lib/sisu/v5/src_kdissert_share.rb b/lib/sisu/v5/src_kdissert_share.rb
index f91aec55..8ccb9708 100644
--- a/lib/sisu/v5/src_kdissert_share.rb
+++ b/lib/sisu/v5/src_kdissert_share.rb
@@ -64,8 +64,12 @@ module SiSU_KdiSource
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   class Source
-    require 'fileutils'
-      include FileUtils
+    begin
+      require 'fileutils'
+        include FileUtils
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('fileutils NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       @opt=opt
       @env=SiSU_Env::InfoEnv.new(@opt.fns)
diff --git a/lib/sisu/v5/sst_from_xml.rb b/lib/sisu/v5/sst_from_xml.rb
index 110d7df5..c969ac31 100644
--- a/lib/sisu/v5/sst_from_xml.rb
+++ b/lib/sisu/v5/sst_from_xml.rb
@@ -64,8 +64,12 @@
 module SiSU_sstFromXML
   require_relative 'sysenv'                             # sysenv.rb
   class Convert
-    require 'rexml/document'
-      include REXML
+    begin
+      require 'rexml/document'
+        include REXML
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rexml/document NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       @opt=opt
       @sisu,@sisu_base=[],[]
diff --git a/lib/sisu/v5/sysenv.rb b/lib/sisu/v5/sysenv.rb
index a8fcbd7a..5563513f 100644
--- a/lib/sisu/v5/sysenv.rb
+++ b/lib/sisu/v5/sysenv.rb
@@ -66,12 +66,20 @@
 module SiSU_Env
   require_relative 'constants'                             # constants.rb
   require_relative 'utils'                                 # utils.rb
-  require 'fileutils'
-    include FileUtils::Verbose
-  require 'singleton'
+  begin
+    require 'singleton'
+    require 'fileutils'
+      include FileUtils::Verbose
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('singleton or fileutils NOT FOUND (LoadError)')
+  end
   @@noyaml=false
   class InfoDate
-    require 'date'
+    begin
+      require 'date'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('date NOT FOUND (LoadError)')
+    end
     attr_accessor :dt,:t
     def initialize
       @dt,@t=Date.today.to_s,Time.now
@@ -97,7 +105,11 @@ module SiSU_Env
     end
   end
   class InfoSystemGen
-    require 'rbconfig'
+    begin
+      require 'rbconfig'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rbconfig NOT FOUND (LoadError)')
+    end
     @@user,@@home,@@hostname,@@pwd,@@sisu_etc,@@host,@@arch,@@rbver,@@dir_arch,@@dir_sitearch,@@dir_bin,@@locale,@@rc,@@sisurc_path,@@ad=ENV['USER'],ENV['HOME'],ENV['HOSTNAME'],ENV['PWD'],Config::CONFIG['sysconfdir'] + '/sisu',Config::CONFIG['host'],Config::CONFIG['arch'],%x{ruby -v}.strip,Config::CONFIG['archdir'],Config::CONFIG['sitearchdir'],Config::CONFIG['bindir'],%x{locale charmap}.strip,nil,nil,{} # %x{ruby -v}.strip # Config::CONFIG['rb_ver']
     out=Config::CONFIG['localstatedir']
     etc=Config::CONFIG['sysconfdir'] + '/sisu'
@@ -242,10 +254,18 @@ module SiSU_Env
       end
       if load_prog \
       and @prog=~/dbi/
-        require 'dbi' #revisit
+        begin
+          require 'dbi'
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('dbi NOT FOUND (LoadError)')
+        end
       end
       if load_prog
-        require @prog
+        begin
+          require @prog
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error("#{@prog} NOT FOUND (LoadError)")
+        end
       else
         @mandatory \
         ? (SiSU_Screen::Ansi.new(@prog,"*WARN* module required: #{@prog}").warn)
@@ -330,7 +350,11 @@ module SiSU_Env
               f=S_CONF[:rc_yml]
               p_f="#{v}/#{f}"
               if FileTest.exist?(p_f)
-                require 'yaml'
+                begin
+                  require 'yaml'
+                rescue LoadError
+                  SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('yaml NOT FOUND (LoadError)')
+                end
                 @@sisurc_path=v
                 @@rc=YAML::load(File::open(p_f))
                 break
@@ -339,7 +363,11 @@ module SiSU_Env
                 f='sisurc.yaml'
                 p_f="#{v}/#{f}"
                 if FileTest.exist?(p_f)
-                  require 'yaml'
+                  begin
+                    require 'yaml'
+                  rescue LoadError
+                    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('yaml NOT FOUND (LoadError)')
+                  end
                   @@sisurc_path=v
                   @@rc=YAML::load(File::open(p_f))
                   break
@@ -378,7 +406,11 @@ module SiSU_Env
           else
             if FileTest.exist?("#{v}/list.yml")
               unless @@ad[:promo_list]
-                require 'yaml'
+                begin
+                  require 'yaml'
+                rescue LoadError
+                  SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('yaml NOT FOUND (LoadError)')
+                end
                 @@ad[:promo_list] ||= YAML::load(File::open("#{v}/list.yml"))
               end
               @@ad[:flag_promo]=true
@@ -396,7 +428,11 @@ module SiSU_Env
           else
             if FileTest.exist?("#{v}/promo.yml")
               unless @@ad[:promo]
-                require 'yaml'
+                begin
+                  require 'yaml'
+                rescue LoadError
+                  SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('yaml NOT FOUND (LoadError)')
+                end
                 @@ad[:promo] ||= YAML::load(File::open("#{v}/promo.yml"))
               end
               @@ad[:flag_promo]=true
@@ -1030,9 +1066,13 @@ module SiSU_Env
     end
   end
   class InfoEnv < EnvCall
-    require 'pathname'
-    require 'fileutils'
-      include FileUtils
+    begin
+      require 'pathname'
+      require 'fileutils'
+        include FileUtils
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pathname or fileutils NOT FOUND (LoadError)')
+    end
     attr_accessor :filename,:sys,:home,:hostname,:user,:env,:rc,:www,:fnb,:fnn,:fnt,:flv,:webserv_path,:stub_pwd,:stub_src,:webserv_host_cgi,:webserv_port_cgi,:processing,:processing_git,:etc,:yamlrc_dir
     @@image_flag,@@local_image=true,true   #warning on @@image_flag
     @@fb,@@man_path=nil,nil
@@ -3169,8 +3209,12 @@ WOK
     end
   end
   class CleanOutput
-    require 'fileutils'
-      include FileUtils::Verbose
+    begin
+      require 'fileutils'
+        include FileUtils::Verbose
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('fileutils NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       @opt=opt
       z=SiSU_Env::FileMap.new(opt)
@@ -3326,7 +3370,11 @@ WOK
   end
   class InfoRemote < FileMap
     @@flag_remote=false
-    require 'socket'
+    begin
+      require 'socket'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('socket NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       super(opt) #
       @opt=opt
@@ -3674,8 +3722,12 @@ WOK
   end
   class InfoVersion <InfoEnv
     include Singleton
-    require 'rbconfig'
-    require 'yaml'
+    begin
+      require 'rbconfig'
+      require 'yaml'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rbconfig or yaml NOT FOUND (LoadError)')
+    end
     @@lib_path=nil
     def get_version
       @version={}
@@ -4291,7 +4343,14 @@ WOK
         DBI.connect(sqlite_discrete.dbi)
       end
       def conn_sqlite3
-        SQLite3::Database.new(sqlite_discrete.sqlite3)
+        begin
+          $sqlite3=:yes
+          require 'sqlite3'
+          SQLite3::Database.new(sqlite_discrete.sqlite3)
+        rescue LoadError
+          $sqlite3=:no
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('sqlite3 NOT FOUND (LoadError)')
+        end
       end
       self
     end
diff --git a/lib/sisu/v5/texpdf.rb b/lib/sisu/v5/texpdf.rb
index d0d88886..dc64bd4c 100644
--- a/lib/sisu/v5/texpdf.rb
+++ b/lib/sisu/v5/texpdf.rb
@@ -61,7 +61,11 @@
 
 =end
 module SiSU_TeX
-  require 'pstore'
+  begin
+    require 'pstore'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pstore NOT FOUND (LoadError)')
+  end
   require_relative 'defaults'                           # defaults.rb
     include SiSU_Viz
   require_relative 'particulars'                        # particulars.rb
@@ -78,7 +82,11 @@ module SiSU_TeX
   @@n=@@tableheader=@@rights=nil
   @@date ||=SiSU_Env::InfoDate.new
   class Source
-    require 'pstore'
+    begin
+      require 'pstore'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pstore NOT FOUND (LoadError)')
+    end
     require_relative 'sysenv'                           # sysenv.rb
       include SiSU_Env
     include SiSU_Viz
diff --git a/lib/sisu/v5/utils.rb b/lib/sisu/v5/utils.rb
index 97ca24be..1c04d886 100644
--- a/lib/sisu/v5/utils.rb
+++ b/lib/sisu/v5/utils.rb
@@ -127,6 +127,12 @@ module SiSU_Utils
     def mark(v=nil,x=nil)
       puts set(v,x)
     end
+    def warn(v=nil,x=nil)
+      STDERR.puts set(v,'*WARN* ' + x)
+    end
+    def error(v=nil,x=nil)
+      STDERR.puts set(v,'*ERROR* ' + x)
+    end
   end
   class Path
     def initialize(dir=Dir.pwd)
diff --git a/lib/sisu/v5/webrick.rb b/lib/sisu/v5/webrick.rb
index baf468c2..e43d8cd1 100644
--- a/lib/sisu/v5/webrick.rb
+++ b/lib/sisu/v5/webrick.rb
@@ -63,12 +63,16 @@
 =end
 module SiSU_Webserv
   class WebrickStart
+    begin
+      require 'time'
       require 'webrick'
         include WEBrick
-      require 'time'
-      require_relative 'sysenv'                             # sysenv.rb
-        include SiSU_Env
-        include SiSU_Screen
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('time or webrick NOT FOUND (LoadError)')
+    end
+    require_relative 'sysenv'                             # sysenv.rb
+      include SiSU_Env
+      include SiSU_Screen
     def initialize
     begin                                                                          #%
       @cX=SiSU_Screen::Ansi.new('yes').cX
@@ -97,9 +101,13 @@ module SiSU_Webserv
                                                                #% wb_top
       wb_top=%q(#!/usr/bin/env ruby
       # * arch-tag: webrick info on environment, mounted directories, and contents of pwd
-      require 'time'
-      require 'cgi'
-      require 'fcgi'
+      begin
+        require 'time'
+        require 'cgi'
+        require 'fcgi'
+      rescue LoadError
+        puts 'time, cgi or fcgi NOT FOUND (LoadError)'
+      end
       ls=Dir.entries('./')
       dir_contents=[]
       ls.each { |x| dir_contents << "<a href=\"./#{x}/\">#{x}</a><br>" unless x =~/^(\.)+$/ }
diff --git a/lib/sisu/v5/xhtml_epub2.rb b/lib/sisu/v5/xhtml_epub2.rb
index 33e3a529..2073bb4b 100644
--- a/lib/sisu/v5/xhtml_epub2.rb
+++ b/lib/sisu/v5/xhtml_epub2.rb
@@ -61,7 +61,11 @@
 
 =end
 module SiSU_XHTML_EPUB2
-  require 'pstore'
+  begin
+    require 'pstore'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pstore NOT FOUND (LoadError)')
+  end
   require_relative 'particulars'                        # particulars.rb
     include SiSU_Particulars
   require_relative 'defaults'                           # defaults.rb
diff --git a/lib/sisu/v5/xml_fictionbook2.rb b/lib/sisu/v5/xml_fictionbook2.rb
index 6549fa12..c72332bb 100644
--- a/lib/sisu/v5/xml_fictionbook2.rb
+++ b/lib/sisu/v5/xml_fictionbook2.rb
@@ -227,7 +227,11 @@ module SiSU_XML_Fictionbook
         endnotes
       end
       def extract_images                                #work on
-        require "base64"
+        begin
+          require 'base64'
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('base64 NOT FOUND (LoadError)')
+        end
         images_raw,images_base64_fb2=[],[]
         images_base64={}
         if defined? @md.make.cover_image[:cover]
diff --git a/lib/sisu/v5/xml_odf_odt.rb b/lib/sisu/v5/xml_odf_odt.rb
index a6a7a127..3cb2fbbf 100644
--- a/lib/sisu/v5/xml_odf_odt.rb
+++ b/lib/sisu/v5/xml_odf_odt.rb
@@ -73,8 +73,12 @@ module SiSU_XML_ODF_ODT
   require_relative 'txt_shared'                         # txt_shared.rb
   @@alt_id_count,@@alt_id_count,@@tablehead,@@number_of_cols=0,0,0,0
   class Source
-    require 'zlib'
-    require 'find'
+    begin
+      require 'zlib'
+      require 'find'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('zlib or find NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       @opt=opt
       @particulars=SiSU_Particulars::CombinedSingleton.instance.get_all(opt)
diff --git a/lib/sisu/v6/ao_hash_digest.rb b/lib/sisu/v6/ao_hash_digest.rb
index b2fd8bfd..ce45b9e4 100644
--- a/lib/sisu/v6/ao_hash_digest.rb
+++ b/lib/sisu/v6/ao_hash_digest.rb
@@ -75,7 +75,11 @@ module SiSU_AO_Hash
       data=@data.compact
       @tuned_file=[]
       sha_ =(@env.digest.type=='sha256' ? true : false)
-      sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+      begin
+        sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+      rescue LoadError
+        SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error((sha_ ? 'digest/sha2' : 'digest/md5') + ' NOT FOUND')
+      end
       data.each do |t_o|
         unless t_o.obj.is_a?(Array)
           t_o.obj=t_o.obj.strip
diff --git a/lib/sisu/v6/ao_images.rb b/lib/sisu/v6/ao_images.rb
index 76721d63..0279994d 100644
--- a/lib/sisu/v6/ao_images.rb
+++ b/lib/sisu/v6/ao_images.rb
@@ -62,8 +62,12 @@
 =end
 module SiSU_AO_Images
   class Images
-    #require 'RMagick'
-    #include Magick
+    #begin
+    #  require 'RMagick'
+    #  include Magick
+    #rescue LoadError
+    #  SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('RMagic NOT FOUND (LoadError)')
+    #end
     def initialize(md,data)
       @md,@data=md,data
     end
diff --git a/lib/sisu/v6/cgi_pgsql.rb b/lib/sisu/v6/cgi_pgsql.rb
index 2bcd42e3..3b0b610b 100644
--- a/lib/sisu/v6/cgi_pgsql.rb
+++ b/lib/sisu/v6/cgi_pgsql.rb
@@ -192,9 +192,13 @@ module  SiSU_CGI_PgSQL
  * Description: generates naive cgi search form for search of sisu database (pgsql)
 #{gpl}
 =end
-      require 'cgi'
-      require 'fcgi'
-      require 'dbi'
+      begin
+        require 'cgi'
+        require 'fcgi'
+        require 'dbi'
+      rescue LoadError
+        puts 'cgi, fcgi or dbi NOT FOUND (LoadError)'
+      end
       @stub_default='#{@name_of[:db]}'
       @image_src='#{@image_src}'
       @hosturl_cgi='#{@name_of[:host_url_cgi]}'
diff --git a/lib/sisu/v6/cgi_sqlite.rb b/lib/sisu/v6/cgi_sqlite.rb
index fff0f98f..daf915e6 100644
--- a/lib/sisu/v6/cgi_sqlite.rb
+++ b/lib/sisu/v6/cgi_sqlite.rb
@@ -165,9 +165,13 @@ module  SiSU_CGI_SQLite
  * Description: generates naive cgi search form for search of sisu database (sqlite)
 #{gpl}
 =end
-      require 'cgi'
-      require 'fcgi'
-      require 'dbi'
+      begin
+        require 'cgi'
+        require 'fcgi'
+        require 'dbi'
+      rescue LoadError
+        puts 'cgi, fcgi or dbi NOT FOUND (LoadError)'
+      end
       @stub_default='sisu_sqlite'
       @image_src='#{@image_src}'
       @hosturl_cgi='#{@env.url.webserv_base_cgi(@opt)}/cgi-bin'
diff --git a/lib/sisu/v6/composite.rb b/lib/sisu/v6/composite.rb
index 044f31c4..ebbd14f6 100644
--- a/lib/sisu/v6/composite.rb
+++ b/lib/sisu/v6/composite.rb
@@ -178,10 +178,14 @@ module SiSU_Assemble
           end
           tuned_file << if loadfile =~ /(?:https?|file):\/\/\S+?\.ss[ti]$/ # and NetTest
             imagedir = /((?:https?|file):\/\/\S+?)\/[^\/]+?\.ss[ti]$/.match(loadfile).captures.join + '/_sisu/image' #watch
-            require 'uri'
+            begin
+              require 'uri'
+              require 'open-uri'
+              require 'pp'
+            rescue LoadError
+              SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('uri, open-uri or pp NOT FOUND (LoadError)')
+            end
             image_uri=URI.parse(imagedir)
-            require 'open-uri'
-            require 'pp'
             insert=open(loadfile)
             insert_array=insert.dup
             insert.close
diff --git a/lib/sisu/v6/db_import.rb b/lib/sisu/v6/db_import.rb
index e9fc4d5c..e1342b1d 100644
--- a/lib/sisu/v6/db_import.rb
+++ b/lib/sisu/v6/db_import.rb
@@ -66,7 +66,6 @@ module SiSU_DbImport
   require_relative 'db_load_tuple'                      # db_load_tuple.rb
   require_relative 'db_sqltxt'                          # db_sqltxt.rb
   require_relative 'html_lite_shared'                   # html_lite_shared.rb
-  require 'sqlite3'
   class Import < SiSU_DbText::Prepare
     include SiSU_Param
     include SiSU_Screen
diff --git a/lib/sisu/v6/dbi.rb b/lib/sisu/v6/dbi.rb
index 6804ab97..acb75e0f 100644
--- a/lib/sisu/v6/dbi.rb
+++ b/lib/sisu/v6/dbi.rb
@@ -120,9 +120,12 @@ manually create the database: "#{cX.green}#{@db.db}#{cX.off}" if it does not yet
     end
     def read_sqlite
       begin
-        @conn=@db.sqlite.conn_sqlite3
-      rescue
-      ensure
+        begin
+          require 'sqlite3'
+          @conn=@db.sqlite.conn_sqlite3
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('sqlite3 NOT FOUND (LoadError)')
+        end
       end
     end
     def connect
diff --git a/lib/sisu/v6/dbi_discrete.rb b/lib/sisu/v6/dbi_discrete.rb
index b842c767..0ac84db4 100644
--- a/lib/sisu/v6/dbi_discrete.rb
+++ b/lib/sisu/v6/dbi_discrete.rb
@@ -69,8 +69,12 @@ module  SiSU_DBI_Discrete                               #% database building
     include SiSU_DbDBI
   require_relative 'html_lite_shared'                   # html_lite_shared.rb
     include SiSU_FormatShared
-  require 'fileutils'
-    include FileUtils::Verbose
+  begin
+    require 'fileutils'
+      include FileUtils::Verbose
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('fileutils NOT FOUND (LoadError)')
+  end
   class SQL
     def initialize(opt)
       SiSU_Env::Load.new('dbi',true).prog
@@ -145,9 +149,12 @@ module  SiSU_DBI_Discrete                               #% database building
     end
     def read_sqlite
       begin
-        @conn=@db.sqlite.conn_sqlite3
-      rescue
-      ensure
+        begin
+          require 'sqlite3'
+          @conn=@db.sqlite.conn_sqlite3
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('sqlite3 not available')
+        end
       end
     end
     def connect
diff --git a/lib/sisu/v6/defaults.rb b/lib/sisu/v6/defaults.rb
index ca3c0c04..a26edae9 100644
--- a/lib/sisu/v6/defaults.rb
+++ b/lib/sisu/v6/defaults.rb
@@ -62,7 +62,11 @@
 =end
 $latex_run=nil
 module SiSU_Viz
-  require 'uri'
+  begin
+    require 'uri'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('uri NOT FOUND (LoadError)')
+  end
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   require_relative 'css'                                # css.rb
diff --git a/lib/sisu/v6/html.rb b/lib/sisu/v6/html.rb
index 8a909677..148672e5 100644
--- a/lib/sisu/v6/html.rb
+++ b/lib/sisu/v6/html.rb
@@ -61,7 +61,11 @@
 
 =end
 module SiSU_HTML
-  require 'pstore'
+  begin
+    require 'pstore'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pstore NOT FOUND (LoadError)')
+  end
   require_relative 'particulars'                        # particulars.rb
     include SiSU_Particulars
   require_relative 'defaults'                           # defaults.rb
diff --git a/lib/sisu/v6/hub.rb b/lib/sisu/v6/hub.rb
index 7e2a009d..62b8eaa0 100644
--- a/lib/sisu/v6/hub.rb
+++ b/lib/sisu/v6/hub.rb
@@ -72,7 +72,11 @@ module SiSU
   require_relative 'defaults'                          # defaults.rb
     include SiSU_Viz
   require_relative 'utils'                             # utils.rb
-  require 'uri'
+  begin
+    require 'uri'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('uri NOT FOUND (LoadError)')
+  end
   class HubMaster
     def initialize(argv)
       pwd_the=Dir.pwd
@@ -246,8 +250,12 @@ module SiSU
     end
   end
   class Processing
-    require 'fileutils'
-      include FileUtils
+    begin
+      require 'fileutils'
+        include FileUtils
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('fileutils NOT FOUND (LoadError)')
+    end
     @@env=nil
     attr_accessor :op
     def initialize(opt)
@@ -645,7 +653,11 @@ module SiSU
     end
     def actions
       if @opt.act[:profile][:set]==:on
-        require 'profile'
+        begin
+          require 'profile'
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('profile NOT FOUND (LoadError)')
+        end
       end
       action_on_file_ =if @opt.act[:rsync][:set]==:on \
       && @opt.act[:site_init][:set]==:on
diff --git a/lib/sisu/v6/options.rb b/lib/sisu/v6/options.rb
index 632ac5a8..93d11acc 100644
--- a/lib/sisu/v6/options.rb
+++ b/lib/sisu/v6/options.rb
@@ -62,7 +62,11 @@
 
 =end
 module SiSU_Commandline
-  require 'pathname'
+  begin
+    require 'pathname'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pathname NOT FOUND (LoadError)')
+  end
   require_relative 'sysenv'                             # sysenv.rb
   require_relative 'param_make'                         # param_make.rb
   @@sisu_call_origin_path=nil
diff --git a/lib/sisu/v6/param.rb b/lib/sisu/v6/param.rb
index b74e0dc1..bc9bf9df 100644
--- a/lib/sisu/v6/param.rb
+++ b/lib/sisu/v6/param.rb
@@ -61,8 +61,12 @@
 
 =end
 module SiSU_Param
-  require 'uri'
-  require 'pstore'
+  begin
+    require 'uri'
+    require 'pstore'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('uri or pstore NOT FOUND (LoadError)')
+  end
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   require_relative 'param_make'                         # param_make.rb
diff --git a/lib/sisu/v6/particulars.rb b/lib/sisu/v6/particulars.rb
index 44fa536a..7e850f4c 100644
--- a/lib/sisu/v6/particulars.rb
+++ b/lib/sisu/v6/particulars.rb
@@ -62,7 +62,11 @@
 
 =end
 module SiSU_Particulars
-  require 'singleton'
+  begin
+    require 'singleton'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('singleton NOT FOUND (LoadError)')
+  end
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   require_relative 'param'                              # param.rb
diff --git a/lib/sisu/v6/remote.rb b/lib/sisu/v6/remote.rb
index 3c4982c8..ed5d7fba 100644
--- a/lib/sisu/v6/remote.rb
+++ b/lib/sisu/v6/remote.rb
@@ -112,8 +112,12 @@ module SiSU_Remote
       @tell=lambda { SiSU_Screen::Ansi.new(@opt.act[:color_state][:set],@msg,"#{@msgs.inspect if @msgs}") }
     end
     def fns
-      require 'open-uri'
-      require 'pp'
+      begin
+        require 'open-uri'
+        require 'pp'
+      rescue LoadError
+        SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('open-uri or pp NOT FOUND (LoadError)')
+      end
       require_relative 'composite'                      # composite.rb
       @rgx_image=/(?:^|[^_\\])\{\s*(\S+?\.(?:png|jpg|gif))/
       threads=[]
@@ -158,7 +162,11 @@ module SiSU_Remote
     def sisupod
       get_p=@get_s
       if get_p.length > 0                                     #% remote sisupod
-         require 'net/http'
+        begin
+          require 'net/http'
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('net/http NOT FOUND (LoadError)')
+        end
         for requested_pod in get_p
           pod_info=RemoteDownload.new(requested_pod)
           Net::HTTP.start(pod_info.pod.site) do |http|
diff --git a/lib/sisu/v6/rexml.rb b/lib/sisu/v6/rexml.rb
index f9b94cee..63e70a42 100644
--- a/lib/sisu/v6/rexml.rb
+++ b/lib/sisu/v6/rexml.rb
@@ -62,14 +62,22 @@
 =end
 module SiSU_Rexml
   # load XML file for REXML parsing
-  require 'rexml/document' if FileTest.directory?("#{Config::CONFIG['rubylibdir']}/rexml") #Config::CONFIG['sitedir']
+  begin
+    require 'rexml/document' if FileTest.directory?("#{Config::CONFIG['rubylibdir']}/rexml") #Config::CONFIG['sitedir']
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rexml/document NOT FOUND (LoadError)')
+  end
   require_relative 'param'                              # param.rb
     include SiSU_Param
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   include SiSU_Viz
   class Rexml
-    require 'rexml/document' if FileTest.directory?("#{Config::CONFIG['rubylibdir']}/rexml") #Config::CONFIG['sitedir']
+    begin
+      require 'rexml/document' if FileTest.directory?("#{Config::CONFIG['rubylibdir']}/rexml") #Config::CONFIG['sitedir']
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rexml/document NOT FOUND (LoadError)')
+    end
     def initialize(md,fno)
       @md,@fno=md,fno
       @env=SiSU_Env::InfoEnv.new(@md.fns)
diff --git a/lib/sisu/v6/shared_markup_alt.rb b/lib/sisu/v6/shared_markup_alt.rb
index b84d167a..4971dde0 100644
--- a/lib/sisu/v6/shared_markup_alt.rb
+++ b/lib/sisu/v6/shared_markup_alt.rb
@@ -208,7 +208,11 @@ module SiSU_TextRepresentation
       end
       @env ||=SiSU_Env::InfoEnv.new(@md.fns)
       @sha_ =((@env.digest.type =='sha256') ? true : false)
-      @sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+      begin
+        @sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+      rescue LoadError
+        SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error((@sha_ ? 'digest/sha2' : 'digest/md5') + ' NOT FOUND')
+      end
     end
     def digest(txt)
       d=nil
diff --git a/lib/sisu/v6/src_kdissert_share.rb b/lib/sisu/v6/src_kdissert_share.rb
index ecf559fb..9624e460 100644
--- a/lib/sisu/v6/src_kdissert_share.rb
+++ b/lib/sisu/v6/src_kdissert_share.rb
@@ -64,8 +64,12 @@ module SiSU_KdiSource
   require_relative 'sysenv'                             # sysenv.rb
     include SiSU_Env
   class Source
-    require 'fileutils'
-      include FileUtils
+    begin
+      require 'fileutils'
+        include FileUtils
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('fileutils NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       @opt=opt
       @env=SiSU_Env::InfoEnv.new(@opt.fns)
diff --git a/lib/sisu/v6/sst_from_xml.rb b/lib/sisu/v6/sst_from_xml.rb
index 728f3f54..ee864b03 100644
--- a/lib/sisu/v6/sst_from_xml.rb
+++ b/lib/sisu/v6/sst_from_xml.rb
@@ -64,8 +64,12 @@
 module SiSU_sstFromXML
   require_relative 'sysenv'                             # sysenv.rb
   class Convert
-    require 'rexml/document'
-      include REXML
+    begin
+      require 'rexml/document'
+        include REXML
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rexml/document NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       @opt=opt
       @sisu,@sisu_base=[],[]
diff --git a/lib/sisu/v6/sysenv.rb b/lib/sisu/v6/sysenv.rb
index 46bb30ca..437d4088 100644
--- a/lib/sisu/v6/sysenv.rb
+++ b/lib/sisu/v6/sysenv.rb
@@ -66,12 +66,20 @@
 module SiSU_Env
   require_relative 'constants'                             # constants.rb
   require_relative 'utils'                                 # utils.rb
-  require 'fileutils'
-    include FileUtils::Verbose
-  require 'singleton'
+  begin
+    require 'singleton'
+    require 'fileutils'
+      include FileUtils::Verbose
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('singleton or fileutils NOT FOUND (LoadError)')
+  end
   @@noyaml=false
   class InfoDate
-    require 'date'
+    begin
+      require 'date'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('date NOT FOUND (LoadError)')
+    end
     attr_accessor :dt,:t
     def initialize
       @dt,@t=Date.today.to_s,Time.now
@@ -97,7 +105,11 @@ module SiSU_Env
     end
   end
   class InfoSystemGen
-    require 'rbconfig'
+    begin
+      require 'rbconfig'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rbconfig NOT FOUND (LoadError)')
+    end
     @@user,@@home,@@hostname,@@pwd,@@sisu_etc,@@host,@@arch,@@rbver,@@dir_arch,@@dir_sitearch,@@dir_bin,@@locale,@@rc,@@sisurc_path,@@ad=ENV['USER'],ENV['HOME'],ENV['HOSTNAME'],ENV['PWD'],Config::CONFIG['sysconfdir'] + '/sisu',Config::CONFIG['host'],Config::CONFIG['arch'],%x{ruby -v}.strip,Config::CONFIG['archdir'],Config::CONFIG['sitearchdir'],Config::CONFIG['bindir'],%x{locale charmap}.strip,nil,nil,{} # %x{ruby -v}.strip # Config::CONFIG['rb_ver']
     out=Config::CONFIG['localstatedir']
     etc=Config::CONFIG['sysconfdir'] + '/sisu'
@@ -242,10 +254,18 @@ module SiSU_Env
       end
       if load_prog \
       and @prog=~/dbi/
-        require 'dbi' #revisit
+        begin
+          require 'dbi'
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('dbi NOT FOUND (LoadError)')
+        end
       end
       if load_prog
-        require @prog
+        begin
+          require @prog
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error("#{@prog} NOT FOUND (LoadError)")
+        end
       else
         @mandatory \
         ? (SiSU_Screen::Ansi.new(@prog,"*WARN* module required: #{@prog}").warn)
@@ -330,7 +350,11 @@ module SiSU_Env
               f=S_CONF[:rc_yml]
               p_f="#{v}/#{f}"
               if FileTest.exist?(p_f)
-                require 'yaml'
+                begin
+                  require 'yaml'
+                rescue LoadError
+                  SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('yaml NOT FOUND (LoadError)')
+                end
                 @@sisurc_path=v
                 @@rc=YAML::load(File::open(p_f))
                 break
@@ -339,7 +363,11 @@ module SiSU_Env
                 f='sisurc.yaml'
                 p_f="#{v}/#{f}"
                 if FileTest.exist?(p_f)
-                  require 'yaml'
+                  begin
+                    require 'yaml'
+                  rescue LoadError
+                    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('yaml NOT FOUND (LoadError)')
+                  end
                   @@sisurc_path=v
                   @@rc=YAML::load(File::open(p_f))
                   break
@@ -378,7 +406,11 @@ module SiSU_Env
           else
             if FileTest.exist?("#{v}/list.yml")
               unless @@ad[:promo_list]
-                require 'yaml'
+                begin
+                  require 'yaml'
+                rescue LoadError
+                  SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('yaml NOT FOUND (LoadError)')
+                end
                 @@ad[:promo_list] ||= YAML::load(File::open("#{v}/list.yml"))
               end
               @@ad[:flag_promo]=true
@@ -396,7 +428,11 @@ module SiSU_Env
           else
             if FileTest.exist?("#{v}/promo.yml")
               unless @@ad[:promo]
-                require 'yaml'
+                begin
+                  require 'yaml'
+                rescue LoadError
+                  SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('yaml NOT FOUND (LoadError)')
+                end
                 @@ad[:promo] ||= YAML::load(File::open("#{v}/promo.yml"))
               end
               @@ad[:flag_promo]=true
@@ -1030,9 +1066,13 @@ module SiSU_Env
     end
   end
   class InfoEnv < EnvCall
-    require 'pathname'
-    require 'fileutils'
-      include FileUtils
+    begin
+      require 'pathname'
+      require 'fileutils'
+        include FileUtils
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pathname or fileutils NOT FOUND (LoadError)')
+    end
     attr_accessor :filename,:sys,:home,:hostname,:user,:env,:rc,:www,:fnb,:fnn,:fnt,:flv,:webserv_path,:stub_pwd,:stub_src,:webserv_host_cgi,:webserv_port_cgi,:processing,:processing_git,:etc,:yamlrc_dir
     @@image_flag,@@local_image=true,true   #warning on @@image_flag
     @@fb,@@man_path=nil,nil
@@ -3169,8 +3209,12 @@ WOK
     end
   end
   class CleanOutput
-    require 'fileutils'
-      include FileUtils::Verbose
+    begin
+      require 'fileutils'
+        include FileUtils::Verbose
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('fileutils NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       @opt=opt
       z=SiSU_Env::FileMap.new(opt)
@@ -3326,7 +3370,11 @@ WOK
   end
   class InfoRemote < FileMap
     @@flag_remote=false
-    require 'socket'
+    begin
+      require 'socket'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('socket NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       super(opt) #
       @opt=opt
@@ -3674,8 +3722,12 @@ WOK
   end
   class InfoVersion <InfoEnv
     include Singleton
-    require 'rbconfig'
-    require 'yaml'
+    begin
+      require 'rbconfig'
+      require 'yaml'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('rbconfig or yaml NOT FOUND (LoadError)')
+    end
     @@lib_path=nil
     def get_version
       @version={}
@@ -4291,7 +4343,14 @@ WOK
         DBI.connect(sqlite_discrete.dbi)
       end
       def conn_sqlite3
-        SQLite3::Database.new(sqlite_discrete.sqlite3)
+        begin
+          $sqlite3=:yes
+          require 'sqlite3'
+          SQLite3::Database.new(sqlite_discrete.sqlite3)
+        rescue LoadError
+          $sqlite3=:no
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('sqlite3 NOT FOUND (LoadError)')
+        end
       end
       self
     end
diff --git a/lib/sisu/v6/texpdf.rb b/lib/sisu/v6/texpdf.rb
index 496f77fe..102cf4b4 100644
--- a/lib/sisu/v6/texpdf.rb
+++ b/lib/sisu/v6/texpdf.rb
@@ -61,7 +61,11 @@
 
 =end
 module SiSU_TeX
-  require 'pstore'
+  begin
+    require 'pstore'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pstore NOT FOUND (LoadError)')
+  end
   require_relative 'defaults'                           # defaults.rb
     include SiSU_Viz
   require_relative 'particulars'                        # particulars.rb
@@ -78,7 +82,11 @@ module SiSU_TeX
   @@n=@@tableheader=@@rights=nil
   @@date ||=SiSU_Env::InfoDate.new
   class Source
-    require 'pstore'
+    begin
+      require 'pstore'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pstore NOT FOUND (LoadError)')
+    end
     require_relative 'sysenv'                           # sysenv.rb
       include SiSU_Env
     include SiSU_Viz
diff --git a/lib/sisu/v6/utils.rb b/lib/sisu/v6/utils.rb
index b0efb3bc..60925f22 100644
--- a/lib/sisu/v6/utils.rb
+++ b/lib/sisu/v6/utils.rb
@@ -127,6 +127,12 @@ module SiSU_Utils
     def mark(v=nil,x=nil)
       puts set(v,x)
     end
+    def warn(v=nil,x=nil)
+      STDERR.puts set(v,'*WARN* ' + x)
+    end
+    def error(v=nil,x=nil)
+      STDERR.puts set(v,'*ERROR* ' + x)
+    end
   end
   class Path
     def initialize(dir=Dir.pwd)
diff --git a/lib/sisu/v6/webrick.rb b/lib/sisu/v6/webrick.rb
index 7a66a1af..97e6548d 100644
--- a/lib/sisu/v6/webrick.rb
+++ b/lib/sisu/v6/webrick.rb
@@ -63,12 +63,16 @@
 =end
 module SiSU_Webserv
   class WebrickStart
+    begin
+      require 'time'
       require 'webrick'
         include WEBrick
-      require 'time'
-      require_relative 'sysenv'                             # sysenv.rb
-        include SiSU_Env
-        include SiSU_Screen
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('time or webrick NOT FOUND (LoadError)')
+    end
+    require_relative 'sysenv'                             # sysenv.rb
+      include SiSU_Env
+      include SiSU_Screen
     def initialize
     begin                                                                          #%
       @cX=SiSU_Screen::Ansi.new('yes').cX
@@ -97,9 +101,13 @@ module SiSU_Webserv
                                                                #% wb_top
       wb_top=%q(#!/usr/bin/env ruby
       # * arch-tag: webrick info on environment, mounted directories, and contents of pwd
-      require 'time'
-      require 'cgi'
-      require 'fcgi'
+      begin
+        require 'time'
+        require 'cgi'
+        require 'fcgi'
+      rescue LoadError
+        puts 'time, cgi or fcgi NOT FOUND (LoadError)'
+      end
       ls=Dir.entries('./')
       dir_contents=[]
       ls.each { |x| dir_contents << "<a href=\"./#{x}/\">#{x}</a><br>" unless x =~/^(\.)+$/ }
diff --git a/lib/sisu/v6/xhtml_epub2.rb b/lib/sisu/v6/xhtml_epub2.rb
index 6447431f..1d4305ab 100644
--- a/lib/sisu/v6/xhtml_epub2.rb
+++ b/lib/sisu/v6/xhtml_epub2.rb
@@ -61,7 +61,11 @@
 
 =end
 module SiSU_XHTML_EPUB2
-  require 'pstore'
+  begin
+    require 'pstore'
+  rescue LoadError
+    SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('pstore NOT FOUND (LoadError)')
+  end
   require_relative 'particulars'                        # particulars.rb
     include SiSU_Particulars
   require_relative 'defaults'                           # defaults.rb
diff --git a/lib/sisu/v6/xml_fictionbook2.rb b/lib/sisu/v6/xml_fictionbook2.rb
index 9cd7909e..0498a7f0 100644
--- a/lib/sisu/v6/xml_fictionbook2.rb
+++ b/lib/sisu/v6/xml_fictionbook2.rb
@@ -227,7 +227,11 @@ module SiSU_XML_Fictionbook
         endnotes
       end
       def extract_images                                #work on
-        require "base64"
+        begin
+          require 'base64'
+        rescue LoadError
+          SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('base64 NOT FOUND (LoadError)')
+        end
         images_raw,images_base64_fb2=[],[]
         images_base64={}
         if defined? @md.make.cover_image[:cover]
diff --git a/lib/sisu/v6/xml_odf_odt.rb b/lib/sisu/v6/xml_odf_odt.rb
index bf9d8df8..b478805f 100644
--- a/lib/sisu/v6/xml_odf_odt.rb
+++ b/lib/sisu/v6/xml_odf_odt.rb
@@ -73,8 +73,12 @@ module SiSU_XML_ODF_ODT
   require_relative 'txt_shared'                         # txt_shared.rb
   @@alt_id_count,@@alt_id_count,@@tablehead,@@number_of_cols=0,0,0,0
   class Source
-    require 'zlib'
-    require 'find'
+    begin
+      require 'zlib'
+      require 'find'
+    rescue LoadError
+      SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error('zlib or find NOT FOUND (LoadError)')
+    end
     def initialize(opt)
       @opt=opt
       @particulars=SiSU_Particulars::CombinedSingleton.instance.get_all(opt)