flake.nix dmd build fix overlay: revert to GCC14

- revert to using GCC14: (current) GCC 15 introduced nullptr in its
  headers, and DMD's ImportC parser needs update to handle it, monitor
  and update

- spine_search build to result/cgi-bin/spine_search instead of
  result/share/cgi-bin/spine_search

- (nix ldc overlay, minor comsetic)

12 files changed, 215 insertions, 424 deletions

diff --git a/.envrc-local b/.envrc-local
index 392dd6e..1bafe75 100644
--- a/.envrc-local
+++ b/.envrc-local
@@ -1,5 +1,5 @@
 export SpineVER=$(git describe --long --tags | sed 's/^[ a-z_-]\+\([0-9.]\+\)/\1/;s/\([^-]*-g\)/r\1/;s/-/./g')
-export SpineSearchBIN=result/share/cgi-bin
+export SpineSearchBIN=result/cgi-bin
 # ❯❯ cgi search form name:
 export SpineCGIform='spine_search'
 # ❯❯ configuration cgi search form path:
diff --git a/.envrc-local_ b/.envrc-local_
index 23b2355..075787d 100644
--- a/.envrc-local_
+++ b/.envrc-local_
@@ -1,6 +1,6 @@
 # -*- mode: sh -*-
 export SpineVER=$(git describe --long --tags | sed 's/^[ a-z_-]\+\([0-9.]\+\)/\1/;s/\([^-]*-g\)/r\1/;s/-/./g')
-export SpineSearchBIN=result/share/cgi-bin
+export SpineSearchBIN=result/cgi-bin
 # ❯❯ cgi search form name:
 export SpineCGIform='spine_search'
 # ❯❯ configuration cgi search form path:
diff --git a/derivation.nix b/derivation.nix
index efe8ebf..a27956f 100644
--- a/derivation.nix
+++ b/derivation.nix
@@ -43,7 +43,7 @@ with (
               src = lib.cleanSource src;
             };
             preFixup = ''
-              find $out/share/cgi-bin -type f -exec ${removeExpr (disallowedReferences deps)} '{}' + || true
+              find $out/cgi-bin -type f -exec ${removeExpr (disallowedReferences deps)} '{}' + || true
             '';
             buildPhase = ''
               runHook preBuild
@@ -71,14 +71,14 @@ with (
             '';
             installPhase = ''
               runHook preInstall
-              mkdir -p $out/share/cgi-bin
-              cp -r "${targetOf package}" $out/share/cgi-bin
-              install -m755 -D $out/share/cgi-bin/spine_search spine_search
+              mkdir -p $out/cgi-bin
+              cp -r "${targetOf package}" $out/cgi-bin
+              install -m755 -D $out/cgi-bin/spine_search spine_search
               runHook postInstall
             '';
             postInstall = ''
-              echo "HERE ${targetOf package} $out/share/cgi-bin"
-              echo `ls -la $out/share/cgi-bin/spine_search`
+              echo "HERE ${targetOf package} $out/cgi-bin"
+              echo `ls -la $out/cgi-bin/spine_search`
             '';
             meta =
               lib.optionalAttrs (package ? description) {
diff --git a/flake.lock b/flake.lock
index 1fc60cf..0e700d9 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1773628058,
-        "narHash": "sha256-hpXH0z3K9xv0fHaje136KY872VT2T5uwxtezlAskQgY=",
+        "lastModified": 1775701739,
+        "narHash": "sha256-2FWWY1rr/+pGUJK1npcVcsWNEblzmKs6VxD3VEvwJSs=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f8573b9c935cfaa162dd62cc9e75ae2db86f85df",
+        "rev": "0f7663154ff2fec150f9dbf5f81ec2785dc1e0db",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1772748350,
-        "narHash": "sha256-UwH0m6iqKHqFSbSc63UqjPNis2OprQ7K4h8C+OVUNtI=",
+        "lastModified": 1775708141,
+        "narHash": "sha256-MjjhikIgXjNcsEzyZmjKXHk+DaEk5ic2h15DC6w4W50=",
         "ref": "refs/heads/main",
-        "rev": "c08461dc2b99618171de1973dc2218d3d14e9fba",
-        "revCount": 28,
+        "rev": "bcb38c5014f2870ba7d6412b0b39c757ad4ae725",
+        "revCount": 29,
         "type": "git",
         "url": "git://git.sisudoc.org/package/dlang-nix-overlays-and-flake"
       },
diff --git a/flake.nix b/flake.nix
index cfddea5..7b0bd7f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,35 +1,28 @@
 {
   description = "a sisu like document parser search form";
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-  #inputs.flake-utils.url = "github:numtide/flake-utils";
   inputs.spine-d-overlay = {
     url = "git://git.sisudoc.org/package/dlang-nix-overlays-and-flake";
     inputs.nixpkgs.follows = "nixpkgs";
-    flake = true;
   };
   outputs = {
     self,
     nixpkgs,
-    #flake-utils,
     spine-d-overlay,
     ...
   }@inputs: let
     pname = "spine_search";
     version = "0.18.0";
-    shell = ./shell.nix;
-    devEnv = ./nixDevEnv.sh;
+    #shell = ./shell.nix;
+    #devEnv = ./nixDevEnv.sh;
     supportedSystems = ["x86_64-linux"];
     forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
     nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;}); # nixpkgs instantiated for supported system types
-    checkPhase = ''
-      runHook preCheck
-      dub test --combined --skip-registry=all
-      runHook postCheck
-    '';
     localOverlay = (final: prev: {
-      ldc = prev.callPackage ./nix-overlays/ldc {  };
-      dmd = prev.callPackage ./nix-overlays/dmd {  };
-      dub = prev.callPackage ./nix-overlays/dub {  };
+      ldc = prev.callPackage ./nix-overlays/ldc {  };                           # -> ok 1.42.0
+      # dmd overlay: revert to GCC14; (current) GCC 15 introduced nullptr in its headers, and DMD's ImportC parser needs update to handle it, monitor and update:
+      dmd = prev.callPackage ./nix-overlays/dmd { stdenv = prev.gcc14Stdenv; }; # -> ok 2.111.0
+      dub = prev.callPackage ./nix-overlays/dub {  };                           # -> ? 1.40.0
       #gdc = prev.callPackage ./nix-overlays/gdc {  };
     });
     pkgsForSystem = system: import nixpkgs {
@@ -41,165 +34,79 @@
     preBuild = ''
       export HOME=$(pwd)
     '';
+    checkPhase = ''
+      runHook preCheck
+      dub test --combined --skip-registry=all
+      runHook postCheck
+    '';
     installPhase = ''
       runHook preInstall
-      mkdir -p $out/share/cgi-bin
-      install -m755 -D ./cgi-bin/spine_search $out/share/cgi-bin/spine_search
+      mkdir -p $out/cgi-bin
+      install -m755 -D ./cgi-bin/spine_search $out/cgi-bin/spine_search
       runHook postInstall
     '';
     postInstall = ''
-      echo `ls -la $out/share/cgi-bin/spine_search`
+      echo `ls -la $out/cgi-bin/spine_search`
     '';
+    # Helper to reduce duplication across build variants
+    mkSpineSearch = {pkgs, compiler, compilerCmd, dubConfig}: pkgs.stdenv.mkDerivation {
+      inherit pname version;
+      meta.mainProgram = "spine_search";
+      src = self;
+      buildInputs = [pkgs.sqlite];
+      nativeBuildInputs = [pkgs.dub compiler pkgs.gnumake];
+      buildPhase = ''
+        runHook preBuild
+        buildCMD="dub run --cache=local --compiler=$(type -P ${compilerCmd}) --build=${dubConfig} --combined --skip-registry=all"
+        echo $buildCMD
+        $buildCMD
+        echo $buildCMD
+        runHook postBuild
+      '';
+      inherit preBuild;
+      inherit checkPhase;
+      inherit installPhase;
+      inherit postInstall;
+    };
   in {
     packages = forAllSystems (system: let
       pkgs-ovl = pkgsForSystem system;
       pkgs-nix = nixpkgsFor.${system};
-    in
-      with pkgs-nix; {
-        default = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine-search";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = [sqlite];
-          nativeBuildInputs = [dub ldc gnumake];
-          buildPhase = ''
-            runHook preBuild
-            for DC_ in dmd ldmd2 ldc2 gdc gdmd; do
-              echo "- check for D compiler $DC_"
-              DC=$(type -P $DC_ || echo "")
-              if [ ! "$DC" == "" ]; then break; fi
-            done
-            if [ "$DC" == "" ]; then exit "Error: could not find D compiler"; fi
-            echo "$DC_ used as D compiler to build $pname"
-            buildCMD="dub run --cache=local --compiler=$DC --build=$DC_ --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        spine-search-nixpkgs-dmd = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine_search-dmd";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = with pkgs-nix; [sqlite];
-          nativeBuildInputs = with pkgs-nix; [dub dmd gnumake];
-          buildPhase = ''
-            runHook preBuild
-            buildCMD="dub run --cache=local --compiler=$(type -P dmd) --build=dmd --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        spine-search-nixpkgs-ldc = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine_search-ldc";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = with pkgs-nix; [sqlite];
-          nativeBuildInputs = with pkgs-nix; [dub ldc gnumake];
-          buildPhase = ''
-            runHook preBuild
-            buildCMD="dub run --cache=local --compiler=$(type -P ldmd2) --build=ldmd2 --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        spine-search-overlay-dmd = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine_search-dmd";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = with pkgs-ovl; [sqlite];
-          nativeBuildInputs = with pkgs-ovl; [dub dmd gnumake];
-          buildPhase = ''
-            runHook preBuild
-            buildCMD="dub run --cache=local --compiler=$(type -P dmd) --build=dmd --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        spine-search-overlay-ldc = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine_search-ldc";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = with pkgs-ovl; [sqlite];
-          nativeBuildInputs = with pkgs-ovl; [dub ldc gnumake];
-          buildPhase = ''
-            runHook preBuild
-            buildCMD="dub run --cache=local --compiler=$(type -P ldmd2) --build=ldmd2 --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        #spine-search-overlay-gdc = stdenv.mkDerivation {
-        #  inherit pname;
-        #  inherit version;
-        #  meta.mainProgram = "spine_search-gdc";
-        #  executable = true;
-        #  src = self;
-        #  inherit shell;
-        #  inherit devEnv;
-        #  buildInputs = with pkgs-ovl; [ sqlite ];
-        #  nativeBuildInputs = with pkgs-ovl; [ dub gdc gnumake ];
-        #  buildPhase = ''
-        #    runHook preBuild
-        #    dub run --cache=local --compiler=$(type -P gdc) --build=gdc --combined --skip-registry=all
-        #    runHook postBuild
-        #  '';
-        #  inherit preBuild;
-        #  inherit checkPhase;
-        #  inherit installPhase;
-        #  inherit postInstall;
-        #};
-        #vendorSha256 = "sha256-0Q00000000000000000000000000000000000000000=";
-      });
+    in {
+      default = self.packages.${system}.spine-search-nixpkgs-ldc;
+      spine-search-nixpkgs-dmd = mkSpineSearch {
+        pkgs = pkgs-nix;
+        # nixpkgs dmd: revert to GCC14 (same nullptr/ImportC fix as overlay dmd)
+        compiler = pkgs-nix.dmd.override { stdenv = pkgs-nix.gcc14Stdenv; };
+        #compiler = pkgs-nix.dmd;
+        compilerCmd = "dmd";
+        dubConfig = "dmd";
+      };
+      spine-search-nixpkgs-ldc = mkSpineSearch {
+        pkgs = pkgs-nix;
+        compiler = pkgs-nix.ldc;
+        compilerCmd = "ldmd2";
+        dubConfig = "ldmd2";
+      };
+      spine-search-overlay-dmd = mkSpineSearch {
+        pkgs = pkgs-ovl;
+        compiler = pkgs-ovl.dmd;
+        compilerCmd = "dmd";
+        dubConfig = "dmd";
+      };
+      spine-search-overlay-ldc = mkSpineSearch {
+        pkgs = pkgs-ovl;
+        compiler = pkgs-ovl.ldc;
+        compilerCmd = "ldmd2";
+        dubConfig = "ldmd2";
+      };
+      #spine-search-overlay-gdc = mkSpineSearch {
+      #  pkgs = pkgs-ovl;
+      #  compiler = pkgs-ovl.gdc;
+      #  compilerCmd = "gdc";
+      #  dubConfig = "gdc";
+      #};
+    });
     devShells = forAllSystems (system: let
       pkgs-ovl = pkgsForSystem system;
       pkgs-nix = nixpkgsFor.${system};
@@ -211,9 +118,7 @@
       with pkgs-nix; {
         dsh-d-overlay = spine-d-overlay.devShells.${system}.default;
         dsh-overlay = mkShell {
-          name = "spine-0.18.0 base dev shell, ldc-1.42.0, dub-1.40.0";
-          inherit shell;
-          inherit devEnv;
+          name = "${pname}-${version} dev shell (overlay)";
           packages = with pkgs-ovl; [
             ldc
             #dmd
@@ -223,10 +128,8 @@
           ];
           inherit shellHook;
         };
-        dsh-nixpkgs-dmd-dub = mkShell {
-          name = "spine-0.18.0 base dev shell";
-          inherit shell;
-          inherit devEnv;
+        dsh-nixpkgs-dmd = mkShell {
+          name = "${pname}-${version} dev shell (nixpkgs dmd)";
           packages = [
             dmd
             dub
@@ -235,10 +138,8 @@
           ];
           inherit shellHook;
         };
-        dsh-nixpkgs-ldc-dub = mkShell {
-          name = "spine-0.18.0 base dev shell";
-          inherit shell;
-          inherit devEnv;
+        dsh-nixpkgs-ldc = mkShell {
+          name = "${pname}-${version} dev shell (nixpkgs ldc)";
           packages = [
             ldc
             dub
@@ -247,10 +148,9 @@
           ];
           inherit shellHook;
         };
-        dsh-overlay-dmd-dub = mkShell {
-          name = "spine-0.18.0 base dev shell, dmd-2.111.0, dub-1.40.0";
-          inherit shell;
-          inherit devEnv;
+        dsh-overlay-dmd = mkShell {
+          name = "${pname}-${version} dev shell (overlay dmd)";
+          # "spine-0.18.0 base dev shell, dmd-2.111.0, dub-1.40.0";
           packages = with pkgs-ovl; [
             dmd
             dub
@@ -259,10 +159,9 @@
           ];
           inherit shellHook;
         };
-        dsh-overlay-ldc-dub = mkShell {
-          name = "spine-0.18.0 base dev shell, ldc-1.42.0, dub-1.40.0";
-          inherit shell;
-          inherit devEnv;
+        dsh-overlay-ldc = mkShell {
+          name = "${pname}-${version} dev shell (overlay ldc)";
+          # "spine-0.18.0 base dev shell, ldc-1.42.0, dub-1.40.0";
           packages = with pkgs-ovl; [
             ldc
             dub
@@ -272,9 +171,7 @@
           inherit shellHook;
         };
         dsh-sqlite = mkShell {
-          name = "spine dev shell for latex & pdf output";
-          inherit shell;
-          inherit devEnv;
+          name = "${pname}-${version} dev shell (sqlite)";
           packages = [
             ldc
             #dmd
diff --git a/makefile b/makefile
index b032d64..922516d 100644
--- a/makefile
+++ b/makefile
@@ -83,7 +83,7 @@ set_depends: get_depends
 # cp cgi search form
 cp-cgi:
 	sudo cp -vi /var/www/cgi/cgi-bin/spine_search /var/www/cgi/cgi-bin/spine_search_old && \
-	sudo cp -vi result/share/cgi-bin/spine_search /var/www/cgi/cgi-bin/spine_search
+	sudo cp -vi result/cgi-bin/spine_search /var/www/cgi/cgi-bin/spine_search
 
 # git archive
 gitZip:
diff --git a/nix-overlays/ldc/package.nix b/nix-overlays/ldc/package.nix
index 75eb898..b5daa75 100644
--- a/nix-overlays/ldc/package.nix
+++ b/nix-overlays/ldc/package.nix
@@ -138,6 +138,8 @@ stdenv.mkDerivation (finalAttrs: {
     find $out/bin -type f -exec ${removeReferencesTo}/bin/remove-references-to -t ${ldcBootstrap} '{}' +
   '';
 
+  # doCheck = false;
+
   disallowedReferences = [ ldcBootstrap ];
 
   meta = with lib; {
@@ -181,6 +183,6 @@ stdenv.mkDerivation (finalAttrs: {
       no-references-to-compiler = helloWorld.overrideAttrs {
         disallowedReferences = [ ldc ];
         dFlags = ["-g"];
+      };
     };
-  };
 })
diff --git a/org/config_env.org b/org/config_env.org
index 8aa8fa7..332f849 100644
--- a/org/config_env.org
+++ b/org/config_env.org
@@ -144,7 +144,7 @@ fi
 #+HEADER: :noweb yes
 #+BEGIN_SRC shell
 export SpineVER=$(git describe --long --tags | sed 's/^[ a-z_-]\+\([0-9.]\+\)/\1/;s/\([^-]*-g\)/r\1/;s/-/./g')
-export SpineSearchBIN=result/share/cgi-bin
+export SpineSearchBIN=result/cgi-bin
 # ❯❯ cgi search form name:
 export SpineCGIform='spine_search'
 # ❯❯ configuration cgi search form path:
diff --git a/org/config_make.org b/org/config_make.org
index 235276f..36a2532 100644
--- a/org/config_make.org
+++ b/org/config_make.org
@@ -134,7 +134,7 @@ set_depends: get_depends
 # cp cgi search form
 cp-cgi:
 	sudo cp -vi /var/www/cgi/cgi-bin/spine_search /var/www/cgi/cgi-bin/spine_search_old && \
-	sudo cp -vi result/share/cgi-bin/spine_search /var/www/cgi/cgi-bin/spine_search
+	sudo cp -vi result/cgi-bin/spine_search /var/www/cgi/cgi-bin/spine_search
 
 # git archive
 gitZip:
diff --git a/org/config_nix.org b/org/config_nix.org
index 142964e..2044cfa 100644
--- a/org/config_nix.org
+++ b/org/config_nix.org
@@ -24,35 +24,28 @@
 {
   description = "a sisu like document parser search form";
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-  #inputs.flake-utils.url = "github:numtide/flake-utils";
   inputs.spine-d-overlay = {
     url = "<<sisudoc_dlang_nix_overlay_src>>";
     inputs.nixpkgs.follows = "nixpkgs";
-    flake = true;
   };
   outputs = {
     self,
     nixpkgs,
-    #flake-utils,
     spine-d-overlay,
     ...
   }@inputs: let
     pname = "spine_search";
     version = "<<spine_version>>";
-    shell = ./shell.nix;
-    devEnv = ./nixDevEnv.sh;
+    #shell = ./shell.nix;
+    #devEnv = ./nixDevEnv.sh;
     supportedSystems = ["x86_64-linux"];
     forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
     nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;}); # nixpkgs instantiated for supported system types
-    checkPhase = ''
-      runHook preCheck
-      dub test --combined --skip-registry=all
-      runHook postCheck
-    '';
     localOverlay = (final: prev: {
-      ldc = prev.callPackage ./nix-overlays/ldc {  };
-      dmd = prev.callPackage ./nix-overlays/dmd {  };
-      dub = prev.callPackage ./nix-overlays/dub {  };
+      ldc = prev.callPackage ./nix-overlays/ldc {  };                           # -> ok <<ldc_version>>
+      # dmd overlay: revert to GCC14; (current) GCC 15 introduced nullptr in its headers, and DMD's ImportC parser needs update to handle it, monitor and update:
+      dmd = prev.callPackage ./nix-overlays/dmd { stdenv = prev.gcc14Stdenv; }; # -> ok <<dmd_version>>
+      dub = prev.callPackage ./nix-overlays/dub {  };                           # -> ? <<dub_version>>
       #gdc = prev.callPackage ./nix-overlays/gdc {  };
     });
     pkgsForSystem = system: import nixpkgs {
@@ -64,165 +57,79 @@
     preBuild = ''
       export HOME=$(pwd)
     '';
+    checkPhase = ''
+      runHook preCheck
+      dub test --combined --skip-registry=all
+      runHook postCheck
+    '';
     installPhase = ''
       runHook preInstall
-      mkdir -p $out/share/cgi-bin
-      install -m755 -D ./cgi-bin/spine_search $out/share/cgi-bin/spine_search
+      mkdir -p $out/cgi-bin
+      install -m755 -D ./cgi-bin/spine_search $out/cgi-bin/spine_search
       runHook postInstall
     '';
     postInstall = ''
-      echo `ls -la $out/share/cgi-bin/spine_search`
+      echo `ls -la $out/cgi-bin/spine_search`
     '';
+    # Helper to reduce duplication across build variants
+    mkSpineSearch = {pkgs, compiler, compilerCmd, dubConfig}: pkgs.stdenv.mkDerivation {
+      inherit pname version;
+      meta.mainProgram = "spine_search";
+      src = self;
+      buildInputs = [pkgs.sqlite];
+      nativeBuildInputs = [pkgs.dub compiler pkgs.gnumake];
+      buildPhase = ''
+        runHook preBuild
+        buildCMD="dub run --cache=local --compiler=$(type -P ${compilerCmd}) --build=${dubConfig} --combined --skip-registry=all"
+        echo $buildCMD
+        $buildCMD
+        echo $buildCMD
+        runHook postBuild
+      '';
+      inherit preBuild;
+      inherit checkPhase;
+      inherit installPhase;
+      inherit postInstall;
+    };
   in {
     packages = forAllSystems (system: let
       pkgs-ovl = pkgsForSystem system;
       pkgs-nix = nixpkgsFor.${system};
-    in
-      with pkgs-nix; {
-        default = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine-search";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = [sqlite];
-          nativeBuildInputs = [dub ldc gnumake];
-          buildPhase = ''
-            runHook preBuild
-            for DC_ in dmd ldmd2 ldc2 gdc gdmd; do
-              echo "- check for D compiler $DC_"
-              DC=$(type -P $DC_ || echo "")
-              if [ ! "$DC" == "" ]; then break; fi
-            done
-            if [ "$DC" == "" ]; then exit "Error: could not find D compiler"; fi
-            echo "$DC_ used as D compiler to build $pname"
-            buildCMD="dub run --cache=local --compiler=$DC --build=$DC_ --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        spine-search-nixpkgs-dmd = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine_search-dmd";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = with pkgs-nix; [sqlite];
-          nativeBuildInputs = with pkgs-nix; [dub dmd gnumake];
-          buildPhase = ''
-            runHook preBuild
-            buildCMD="dub run --cache=local --compiler=$(type -P dmd) --build=dmd --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        spine-search-nixpkgs-ldc = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine_search-ldc";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = with pkgs-nix; [sqlite];
-          nativeBuildInputs = with pkgs-nix; [dub ldc gnumake];
-          buildPhase = ''
-            runHook preBuild
-            buildCMD="dub run --cache=local --compiler=$(type -P ldmd2) --build=ldmd2 --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        spine-search-overlay-dmd = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine_search-dmd";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = with pkgs-ovl; [sqlite];
-          nativeBuildInputs = with pkgs-ovl; [dub dmd gnumake];
-          buildPhase = ''
-            runHook preBuild
-            buildCMD="dub run --cache=local --compiler=$(type -P dmd) --build=dmd --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        spine-search-overlay-ldc = stdenv.mkDerivation {
-          inherit pname;
-          inherit version;
-          meta.mainProgram = "spine_search-ldc";
-          executable = true;
-          src = self;
-          inherit shell;
-          inherit devEnv;
-          buildInputs = with pkgs-ovl; [sqlite];
-          nativeBuildInputs = with pkgs-ovl; [dub ldc gnumake];
-          buildPhase = ''
-            runHook preBuild
-            buildCMD="dub run --cache=local --compiler=$(type -P ldmd2) --build=ldmd2 --combined --skip-registry=all"
-            echo $buildCMD
-            $buildCMD
-            echo $buildCMD
-            runHook postBuild
-          '';
-          inherit preBuild;
-          inherit checkPhase;
-          inherit installPhase;
-          inherit postInstall;
-        };
-        #spine-search-overlay-gdc = stdenv.mkDerivation {
-        #  inherit pname;
-        #  inherit version;
-        #  meta.mainProgram = "spine_search-gdc";
-        #  executable = true;
-        #  src = self;
-        #  inherit shell;
-        #  inherit devEnv;
-        #  buildInputs = with pkgs-ovl; [ sqlite ];
-        #  nativeBuildInputs = with pkgs-ovl; [ dub gdc gnumake ];
-        #  buildPhase = ''
-        #    runHook preBuild
-        #    dub run --cache=local --compiler=$(type -P gdc) --build=gdc --combined --skip-registry=all
-        #    runHook postBuild
-        #  '';
-        #  inherit preBuild;
-        #  inherit checkPhase;
-        #  inherit installPhase;
-        #  inherit postInstall;
-        #};
-        #vendorSha256 = "sha256-0Q00000000000000000000000000000000000000000=";
-      });
+    in {
+      default = self.packages.${system}.spine-search-nixpkgs-ldc;
+      spine-search-nixpkgs-dmd = mkSpineSearch {
+        pkgs = pkgs-nix;
+        # nixpkgs dmd: revert to GCC14 (same nullptr/ImportC fix as overlay dmd)
+        compiler = pkgs-nix.dmd.override { stdenv = pkgs-nix.gcc14Stdenv; };
+        #compiler = pkgs-nix.dmd;
+        compilerCmd = "dmd";
+        dubConfig = "dmd";
+      };
+      spine-search-nixpkgs-ldc = mkSpineSearch {
+        pkgs = pkgs-nix;
+        compiler = pkgs-nix.ldc;
+        compilerCmd = "ldmd2";
+        dubConfig = "ldmd2";
+      };
+      spine-search-overlay-dmd = mkSpineSearch {
+        pkgs = pkgs-ovl;
+        compiler = pkgs-ovl.dmd;
+        compilerCmd = "dmd";
+        dubConfig = "dmd";
+      };
+      spine-search-overlay-ldc = mkSpineSearch {
+        pkgs = pkgs-ovl;
+        compiler = pkgs-ovl.ldc;
+        compilerCmd = "ldmd2";
+        dubConfig = "ldmd2";
+      };
+      #spine-search-overlay-gdc = mkSpineSearch {
+      #  pkgs = pkgs-ovl;
+      #  compiler = pkgs-ovl.gdc;
+      #  compilerCmd = "gdc";
+      #  dubConfig = "gdc";
+      #};
+    });
     devShells = forAllSystems (system: let
       pkgs-ovl = pkgsForSystem system;
       pkgs-nix = nixpkgsFor.${system};
@@ -234,9 +141,7 @@
       with pkgs-nix; {
         dsh-d-overlay = spine-d-overlay.devShells.${system}.default;
         dsh-overlay = mkShell {
-          name = "spine-<<spine_version>> base dev shell, ldc-<<ldc_version>>, dub-<<dub_version>>";
-          inherit shell;
-          inherit devEnv;
+          name = "${pname}-${version} dev shell (overlay)";
           packages = with pkgs-ovl; [
             ldc
             #dmd
@@ -246,10 +151,8 @@
           ];
           inherit shellHook;
         };
-        dsh-nixpkgs-dmd-dub = mkShell {
-          name = "spine-<<spine_version>> base dev shell";
-          inherit shell;
-          inherit devEnv;
+        dsh-nixpkgs-dmd = mkShell {
+          name = "${pname}-${version} dev shell (nixpkgs dmd)";
           packages = [
             dmd
             dub
@@ -258,10 +161,8 @@
           ];
           inherit shellHook;
         };
-        dsh-nixpkgs-ldc-dub = mkShell {
-          name = "spine-<<spine_version>> base dev shell";
-          inherit shell;
-          inherit devEnv;
+        dsh-nixpkgs-ldc = mkShell {
+          name = "${pname}-${version} dev shell (nixpkgs ldc)";
           packages = [
             ldc
             dub
@@ -270,10 +171,9 @@
           ];
           inherit shellHook;
         };
-        dsh-overlay-dmd-dub = mkShell {
-          name = "spine-<<spine_version>> base dev shell, dmd-<<dmd_version>>, dub-<<dub_version>>";
-          inherit shell;
-          inherit devEnv;
+        dsh-overlay-dmd = mkShell {
+          name = "${pname}-${version} dev shell (overlay dmd)";
+          # "spine-<<spine_version>> base dev shell, dmd-<<dmd_version>>, dub-<<dub_version>>";
           packages = with pkgs-ovl; [
             dmd
             dub
@@ -282,10 +182,9 @@
           ];
           inherit shellHook;
         };
-        dsh-overlay-ldc-dub = mkShell {
-          name = "spine-<<spine_version>> base dev shell, ldc-<<ldc_version>>, dub-<<dub_version>>";
-          inherit shell;
-          inherit devEnv;
+        dsh-overlay-ldc = mkShell {
+          name = "${pname}-${version} dev shell (overlay ldc)";
+          # "spine-<<spine_version>> base dev shell, ldc-<<ldc_version>>, dub-<<dub_version>>";
           packages = with pkgs-ovl; [
             ldc
             dub
@@ -295,9 +194,7 @@
           inherit shellHook;
         };
         dsh-sqlite = mkShell {
-          name = "spine dev shell for latex & pdf output";
-          inherit shell;
-          inherit devEnv;
+          name = "${pname}-${version} dev shell (sqlite)";
           packages = [
             ldc
             #dmd
@@ -316,14 +213,32 @@
 ** shell.nix :shell:
 
 #+HEADER: :tangle ../shell.nix
-#+HEADER: :tangle-mode (identity #o755)
-#+HEADER: :shebang "#!/usr/bin/env -S nix-shell --pure\n#!nix-shell -i bash"
 #+HEADER: :noweb yes
 #+BEGIN_SRC nix
 {pkgs-nix ? import <nixpkgs> {}}:
 with pkgs-nix;
   mkShell {
     buildInputs = [
+      # nix workflow
+      direnv
+      nix-direnv
+      nix-prefetch-git
+      nix-output-monitor
+      nix-tree
+      jq
+      git
+      # project build
+      gnumake
+      sqlite
+    ];
+  }
+#+END_SRC
+
+#+BEGIN_SRC nix
+{pkgs-nix ? import <nixpkgs> {}}:
+with pkgs-nix;
+  mkShell {
+    buildInputs = [
       # ❯❯❯ nix_related
       #nix
       direnv
@@ -486,7 +401,7 @@ with (
               src = lib.cleanSource src;
             };
             preFixup = ''
-              find $out/share/cgi-bin -type f -exec ${removeExpr (disallowedReferences deps)} '{}' + || true
+              find $out/cgi-bin -type f -exec ${removeExpr (disallowedReferences deps)} '{}' + || true
             '';
             buildPhase = ''
               runHook preBuild
@@ -514,14 +429,14 @@ with (
             '';
             installPhase = ''
               runHook preInstall
-              mkdir -p $out/share/cgi-bin
-              cp -r "${targetOf package}" $out/share/cgi-bin
-              install -m755 -D $out/share/cgi-bin/spine_search spine_search
+              mkdir -p $out/cgi-bin
+              cp -r "${targetOf package}" $out/cgi-bin
+              install -m755 -D $out/cgi-bin/spine_search spine_search
               runHook postInstall
             '';
             postInstall = ''
-              echo "HERE ${targetOf package} $out/share/cgi-bin"
-              echo `ls -la $out/share/cgi-bin/spine_search`
+              echo "HERE ${targetOf package} $out/cgi-bin"
+              echo `ls -la $out/cgi-bin/spine_search`
             '';
             meta =
               lib.optionalAttrs (package ? description) {
diff --git a/org/nixpkgs_overlays_d_related.org b/org/nixpkgs_overlays_d_related.org
index 17fd309..6023565 100644
--- a/org/nixpkgs_overlays_d_related.org
+++ b/org/nixpkgs_overlays_d_related.org
@@ -649,6 +649,8 @@ stdenv.mkDerivation (finalAttrs: {
     find $out/bin -type f -exec ${removeReferencesTo}/bin/remove-references-to -t ${ldcBootstrap} '{}' +
   '';
 
+  # doCheck = false;
+
   disallowedReferences = [ ldcBootstrap ];
 
   meta = with lib; {
@@ -692,8 +694,8 @@ stdenv.mkDerivation (finalAttrs: {
       no-references-to-compiler = helloWorld.overrideAttrs {
         disallowedReferences = [ ldc ];
         dFlags = ["-g"];
+      };
     };
-  };
 })
 #+END_SRC
 
diff --git a/shell.nix b/shell.nix
index e490db9..cd031ed 100755
--- a/shell.nix
+++ b/shell.nix
@@ -1,42 +1,17 @@
-#!/usr/bin/env -S nix-shell --pure
-#!nix-shell -i bash
 {pkgs-nix ? import <nixpkgs> {}}:
 with pkgs-nix;
   mkShell {
     buildInputs = [
-      # ❯❯❯ nix_related
-      #nix
+      # nix workflow
       direnv
       nix-direnv
-      nixVersions.latest #nixVersions.latest #nixVersions.git
       nix-prefetch-git
-      validatePkgConfig
       nix-output-monitor
       nix-tree
-      jq #gx
-      #nixfmt-rfc-style
+      jq
       git
-      # ❯❯❯ dev
+      # project build
       gnumake
-      ps
-      # ❯❯❯ d_build_related
-      # ❯❯ package manager
-      #dub
-      # ❯❯ compiler
-      #dmd
-      #ldc
-      #rund
-      # ❯❯ linker
-      #lld
-      #mold
-      # ❯❯ builder
-      #ninja
-      #meson
-      # ❯❯❯ sqlite search related
       sqlite
-      # ❯❯❯ tools
-      #aria #wget #curl
     ];
-    shellHook = ''
-    '';
   }