pikchr: enable tcl support

pkgs/tools/graphics/pikchr/default.nix

@@ -1,6 +1,9 @@
 { lib
 , stdenv
 , fetchfossil
+, tcl
+
+, enableTcl ? true
 }:
 
 stdenv.mkDerivation {
@@ -19,14 +22,27 @@ stdenv.mkDerivation {
     substituteInPlace Makefile --replace open "test -f"
   '';
 
+  nativeBuildInputs = lib.optional enableTcl tcl.tclPackageHook;
+
+  buildInputs = lib.optional enableTcl tcl;
+
   makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" ];
 
+  buildFlags = [ "pikchr" ] ++ lib.optional enableTcl "piktcl";
+
   installPhase = ''
+    runHook preInstall
     install -Dm755 pikchr $out/bin/pikchr
     install -Dm755 pikchr.out $out/lib/pikchr.o
     install -Dm644 pikchr.h $out/include/pikchr.h
+  '' + lib.optionalString enableTcl ''
+    cp -r piktcl $out/lib/piktcl
+  '' + ''
+    runHook postInstall
   '';
 
+  dontWrapTclBinaries = true;
+
   doCheck = true;
   checkTarget = "test";