llpp: fix build on darwin

pkgs/applications/misc/llpp/default.nix

@@ -1,5 +1,5 @@
 { stdenv, lib, substituteAll, makeWrapper, fetchFromGitHub, fetchpatch, ocaml, pkg-config, mupdf, libX11, jbig2dec, openjpeg, libjpeg , lcms2, harfbuzz,
-libGLU, libGL, gumbo, freetype, zlib, xclip, inotify-tools, procps }:
+libGLU, libGL, gumbo, freetype, zlib, xclip, inotify-tools, procps, darwin }:
 
 assert lib.versionAtLeast (lib.getVersion ocaml) "4.07";
 
@@ -21,7 +21,9 @@ stdenv.mkDerivation rec {
   strictDeps = true;
 
   nativeBuildInputs = [ makeWrapper ocaml pkg-config ];
-  buildInputs = [ mupdf libX11 libGLU libGL freetype zlib gumbo jbig2dec openjpeg libjpeg lcms2 harfbuzz ];
+  buildInputs = [ mupdf libX11 freetype zlib gumbo jbig2dec openjpeg libjpeg lcms2 harfbuzz ]
+    ++ lib.optionals stdenv.isLinux [ libGLU libGL ]
+    ++ lib.optionals stdenv.isDarwin [ darwin.apple_sdk.frameworks.OpenGL darwin.apple_sdk.frameworks.Cocoa ];
 
   dontStrip = true;
 
@@ -38,7 +40,7 @@ stdenv.mkDerivation rec {
     install -d $out/bin
     install build/llpp $out/bin
     install misc/llpp.inotify $out/bin/llpp.inotify
-
+  '' + lib.optionalString stdenv.isLinux ''
     wrapProgram $out/bin/llpp \
         --prefix PATH ":" "${xclip}/bin"
 
@@ -51,7 +53,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     homepage = "https://repo.or.cz/w/llpp.git";
     description = "A MuPDF based PDF pager written in OCaml";
-    platforms = platforms.linux;
+    platforms = platforms.linux ++ platforms.darwin;
     maintainers = with maintainers; [ pSub ];
     license = licenses.gpl3;
   };