ftgl: fix build, clean up

- patch to fix type mismatch error
- remove conditional Darwin inputs, those are aliased in all-packages.nix now
- clean up postInstall
- remove unnecessary enableParallelBuilding

pkgs/by-name/ft/ftgl/fix-warnings.patch

@@ -0,0 +1,39 @@
+diff --git a/src/FTContour.cpp b/src/FTContour.cpp
+index c668d32..ef13576 100644
+--- a/src/FTContour.cpp
++++ b/src/FTContour.cpp
+@@ -174,7 +174,7 @@ void FTContour::SetParity(int parity)
+ }
+ 
+ 
+-FTContour::FTContour(FT_Vector* contour, char* tags, unsigned int n)
++FTContour::FTContour(FT_Vector* contour, unsigned char* tags, unsigned int n)
+ {
+     FTPoint prev, cur(contour[(n - 1) % n]), next(contour[0]);
+     double olddir, dir = atan2((next - cur).Y(), (next - cur).X());
+diff --git a/src/FTContour.h b/src/FTContour.h
+index d2d187c..dc64e3a 100644
+--- a/src/FTContour.h
++++ b/src/FTContour.h
+@@ -52,7 +52,7 @@ class FTContour
+          * @param pointTags
+          * @param numberOfPoints
+          */
+-        FTContour(FT_Vector* contour, char* pointTags, unsigned int numberOfPoints);
++        FTContour(FT_Vector* contour, unsigned char* pointTags, unsigned int numberOfPoints);
+ 
+         /**
+          * Destructor
+diff --git a/src/FTVectoriser.cpp b/src/FTVectoriser.cpp
+index 26e7da8..53d738e 100644
+--- a/src/FTVectoriser.cpp
++++ b/src/FTVectoriser.cpp
+@@ -168,7 +168,7 @@ void FTVectoriser::ProcessContours()
+     for(int i = 0; i < ftContourCount; ++i)
+     {
+         FT_Vector* pointList = &outline.points[startIndex];
+-        char* tagList = &outline.tags[startIndex];
++        unsigned char* tagList = &outline.tags[startIndex];
+ 
+         endIndex = outline.contours[i];
+         contourLength =  (endIndex - startIndex) + 1;

pkgs/by-name/ft/ftgl/package.nix

@@ -8,12 +8,8 @@
 , libGL
 , libGLU
 , pkg-config
-, darwin
 }:
 
-let
-  inherit (darwin.apple_sdk.frameworks) OpenGL GLUT;
-in
 stdenv.mkDerivation rec {
   pname = "ftgl";
   version = "2.4.0";
@@ -33,6 +29,10 @@ stdenv.mkDerivation rec {
       --replace ' -dylib_file $GL_DYLIB: $GL_DYLIB' ""
   '';
 
+  patches = [
+    ./fix-warnings.patch
+  ];
+
   nativeBuildInputs = [
     autoreconfHook
     doxygen
@@ -40,24 +40,13 @@ stdenv.mkDerivation rec {
   ];
   buildInputs = [
     freetype
-  ] ++ (if stdenv.hostPlatform.isDarwin then [
-    OpenGL
-    GLUT
-  ] else [
     libGL
     libGLU
     libglut
-  ]);
-
-  configureFlags = [
-    "--with-ft-prefix=${lib.getDev freetype}"
   ];
 
-  enableParallelBuilding = true;
-
   postInstall = ''
-    install -Dm644 src/FTSize.h -t ${placeholder "out"}/include/FTGL
-    install -Dm644 src/FTFace.h -t ${placeholder "out"}/include/FTGL
+    install -Dm644 src/FTSize.h src/FTFace.h -t $out/include/FTGL
   '';
 
   meta = with lib; {