SDL_compat: Fix on Darwin

pkgs/development/libraries/SDL_compat/default.nix

···
 { lib
 , stdenv
 , fetchFromGitHub
+, fetchpatch
 , cmake
 , pkg-config
 , SDL2
+, libiconv
+, Cocoa
 , libGLSupported ? lib.elem stdenv.hostPlatform.system lib.platforms.mesaPlatforms
 , openglSupport ? libGLSupported
 , libGL
···
     hash = "sha256-PDGlMI8q74JaqMQ5oX9Zt5CEr7frFQWECbuwq5g25eg=";
   };
 
+  patches = optionals stdenv.hostPlatform.isDarwin [
+    # Fix broken install name in dylib, https://github.com/libsdl-org/sdl12-compat/issues/194
+    # Remove when bump > 1.2.52
+    (fetchpatch {
+      name = "SDL_compat-fix-install-name.patch";
+      url = "https://github.com/libsdl-org/sdl12-compat/commit/5642d47ae489f2eb362cece2464ecc466a700ed5.patch";
+      sha256 = "sha256-kQ5H8gXjTZVHHRF6UpgXKl3NIy87iULcc2iCsYt5Hqo=";
+    })
+  ];
+
   nativeBuildInputs = [ cmake pkg-config ];
 
   propagatedBuildInputs = [ SDL2 ]
+    ++ optionals stdenv.hostPlatform.isDarwin [ libiconv Cocoa ]
     ++ optionals openglSupport [ libGL libGLU ];
 
   enableParallelBuilding = true;
···
   setupHook = ../SDL/setup-hook.sh;
 
   postFixup = ''
-    for lib in $out/lib/*.so* ; do
+    for lib in $out/lib/*${stdenv.hostPlatform.extensions.sharedLibrary}* ; do
       if [[ -L "$lib" ]]; then
-        patchelf --set-rpath "$(patchelf --print-rpath $lib):${makeLibraryPath propagatedBuildInputs}" "$lib"
+        ${if stdenv.hostPlatform.isDarwin then ''
+          install_name_tool ${lib.strings.concatMapStrings (x: " -add_rpath ${makeLibraryPath [x]} ") propagatedBuildInputs} "$lib"
+        '' else ''
+          patchelf --set-rpath "$(patchelf --print-rpath $lib):${makeLibraryPath propagatedBuildInputs}" "$lib"
+        ''}
       fi
     done
   '';
 
   meta = with lib; {
-    broken = stdenv.isDarwin;
     description = "A cross-platform multimedia library - build SDL 1.2 applications against 2.0";
     homepage = "https://www.libsdl.org/";
     license = licenses.zlib;

pkgs/top-level/all-packages.nix

···
     libGLU = null;
   });
 
-  SDL_compat = callPackage ../development/libraries/SDL_compat { };
+  SDL_compat = callPackage ../development/libraries/SDL_compat {
+    inherit (darwin.apple_sdk.frameworks) Cocoa;
+  };
 
   SDL = SDL_classic;