Add GTK3 switch

cd.nix

@@ -3,6 +3,7 @@
 , fetchurl
 , lsb-release
 , pkg-config
+, gtk2
 , gtk3
 , im
 , libGL
@@ -10,6 +11,7 @@
 , lua
 , ftgl-tecgraf
 , lib
+, withGTK3 ? false
 }:
 
 let
@@ -29,7 +31,7 @@ in stdenv.mkDerivation rec {
   ];
   
   buildInputs = [
-    gtk3
+    (if withGTK3 then gtk3 else gtk2)
     libGL
     libGLU
     lua
@@ -49,12 +51,11 @@ in stdenv.mkDerivation rec {
     "NO_DEPEND=Yes"
     "USE_PKGCONFIG=Yes"
     "USE_LUA_VERSION=52"
-    "USE_GTK3=Yes"
     "GTK_DEFAULT=Yes"
 
     "FTGL_LIB=${ftgl-tecgraf}/lib"
     "FTGL_INC=${ftgl-tecgraf}/include"
-  ];
+  ] ++ (if withGTK3 then [ "USE_GTK3=Yes" ] else [ "USE_GTK2=Yes" ]);
   
   NIX_CFLAGS_COMPILE = ''
     -Wno-incompatible-pointer-types
@@ -64,12 +65,12 @@ in stdenv.mkDerivation rec {
     "cd"
     "A vector graphics toolkit with device independent output"
     version
-    "gdk-3.0 pango"
+    (if withGTK3 then "gdk-3.0 pango" else "gdk-2.0 pango")
   );
 
   cdcontextplusPc = builtins.toFile "cdcontextplus.pc" (makePc
     "cdcontextplus"
-    "A vector graphics toolkit with device independent output (dynamic driver loader"
+    "A vector graphics toolkit with device independent output (dynamic driver loader)"
     version
     "pangocairo cairo"
   );

iup.nix

@@ -4,6 +4,7 @@
 , fetchurl
 , lsb-release
 , pkg-config
+, gtk2
 , gtk3
 , webkitgtk_4_1
 , libsoup_3
@@ -13,6 +14,7 @@
 , lua
 , lib
 , ftgl-tecgraf
+, withGTK3 ? false
 }:
 
 let
@@ -32,14 +34,12 @@ in stdenv.mkDerivation rec {
   ];
   
   buildInputs = [
-    gtk3
-    webkitgtk_4_1
-    libsoup_3
+    (if withGTK3 then gtk3 else gtk2)
     libGL
     libGLU
     lua
     ftgl-tecgraf
-  ];
+  ] ++ lib.optional withGTK3 [ webkitgtk_4_1 libsoup_3 ];
 
   propagatedBuildInputs = [
     cd
@@ -48,17 +48,19 @@ in stdenv.mkDerivation rec {
 
   postPatch = ''
     sed -i 's/\biupvled\b//g' Makefile
-
+  '' + lib.optionalString withGTK3 ''
      substituteInPlace srcweb/config.mak \
       --replace-fail "\$(GTK)/include/webkitgtk-4.1" "${webkitgtk_4_1.dev}/include/webkitgtk-4.1" \
       --replace-fail "\$(GTK)/include/libsoup-3.0"   "${libsoup_3.dev}/include/libsoup-3.0"
+  '' + lib.optionalString (!withGTK3) ''
+     sed -i 's/\biupweb\b//g' Makefile
+     sed -i 's/\biupluaweb\b//g' srclua5/Makefile
   '';
   
   makeFlags = [
     "NO_DEPEND=Yes"
     "USE_PKGCONFIG=Yes"
     "USE_LUA_VERSION=52"
-    "USE_GTK3=Yes"
     "GTK_DEFAULT=Yes"
     "LUA_SFX="
     
@@ -68,7 +70,7 @@ in stdenv.mkDerivation rec {
     "LUA_INC=${lua}/include"
     "FTGL_LIB=${ftgl-tecgraf}/lib"
     "FTGL_INC=${ftgl-tecgraf}/include"
-  ];
+  ] ++ (if withGTK3 then [ "USE_GTK3=Yes" ] else [ "USE_GTK2=Yes" ]);
   
   NIX_CFLAGS_COMPILE = ''
     -Wno-implicit-function-declaration
@@ -79,7 +81,7 @@ in stdenv.mkDerivation rec {
     "iup"
     "A portable toolkit for building graphical user interfaces"
     version
-    "gtk+-3.0"
+    (if withGTK3 then "gtk+-3.0" else "gtk+-2.0")
   );
 
   iupglPc = builtins.toFile "iupgl.pc" (makePc
@@ -161,7 +163,6 @@ in stdenv.mkDerivation rec {
     ln -fs $out/lib/libiuplua_mglplot52.so $out/share/lua/5.2/iuplua_mglplot.so 
     ln -fs $out/lib/libiuplua_scintilla52.so $out/share/lua/5.2/iuplua_scintilla.so
     ln -fs $out/lib/libiupluascripterdlg52.so $out/share/lua/5.2/iupluascripterdlg.so
-    ln -fs $out/lib/libiupluaweb52.so $out/share/lua/5.2/iupluaweb.so
     ln -fs $out/lib/libiupluaimglib52.so $out/share/lua/5.2/iupluaimglib.so
 
     cp -v ${iupPc} $out/lib/pkgconfig/iup.pc
@@ -171,12 +172,14 @@ in stdenv.mkDerivation rec {
     cp -v ${iupPlotPc} $out/lib/pkgconfig/iup_plot.pc
     cp -v ${iupimPc} $out/lib/pkgconfig/iupim.pc
     cp -v ${iupimglibPc} $out/lib/pkgconfig/iupimglib.pc
-    cp -v ${iupwebPc} $out/lib/pkgconfig/iupweb.pc
 
     cp -vr bin/Linux*/* $out/bin/
     chmod +x $out/bin/*
     cp -r etc/* $out/etc
-
+  '' + lib.optionalString withGTK3 ''
+    ln -fs $out/lib/libiupluaweb52.so $out/share/lua/5.2/iupluaweb.so
+    cp -v ${iupwebPc} $out/lib/pkgconfig/iupweb.pc
+  '' + ''
     runHook postInstall
   '';