SDL2: include cf-private on darwin

It's not included implicitly by the frameworks anymore.

    Undefined symbols for architecture x86_64:
      "_NSDefaultRunLoopMode", referenced from:
          _Cocoa_PumpEvents in SDL_cocoaevents.o
      "_NSURLIsAliasFileKey", referenced from:
          -[SDLWindow performDragOperation:] in SDL_cocoawindow.o
      "_OBJC_CLASS_$_NSArray", referenced from:
          objc-class-ref in SDL_cocoaclipboard.o
          objc-class-ref in SDL_cocoakeyboard.o
          objc-class-ref in SDL_cocoawindow.o
      "_OBJC_CLASS_$_NSData", referenced from:
          objc-class-ref in SDL_cocoamouse.o
      "_OBJC_CLASS_$_NSDate", referenced from:
          objc-class-ref in SDL_cocoaevents.o
      "_OBJC_CLASS_$_NSDictionary", referenced from:
          objc-class-ref in SDL_cocoaevents.o
      "_OBJC_CLASS_$_NSMutableArray", referenced from:
          objc-class-ref in SDL_cocoawindow.o
      "_OBJC_CLASS_$_NSURL", referenced from:
          objc-class-ref in SDL_cocoawindow.o
      "_OBJC_CLASS_$_NSUserDefaults", referenced from:
          objc-class-ref in SDL_cocoaevents.o
      "_OBJC_EHTYPE_$_NSException", referenced from:
          GCC_except_table67 in SDL_cocoawindow.o
    ld: symbol(s) not found for architecture x86_64

1 files changed, 6 insertions, 2 deletions

diff --git a/pkgs/development/libraries/SDL2/default.nix b/pkgs/development/libraries/SDL2/default.nix
index 7d8f5b2caee..4b358f68a11 100644
--- a/pkgs/development/libraries/SDL2/default.nix
+++ b/pkgs/development/libraries/SDL2/default.nix
@@ -8,7 +8,7 @@
 , ibusSupport ? false, ibus
 , pulseaudioSupport ? true, libpulseaudio
 , AudioUnit, Cocoa, CoreAudio, CoreServices, ForceFeedback, OpenGL
-, audiofile, libiconv
+, audiofile, cf-private, libiconv
 }:
 
 # NOTE: When editing this expression see if the same change applies to
@@ -54,7 +54,11 @@ stdenv.mkDerivation rec {
   buildInputs = [ audiofile libiconv ]
     ++ dlopenBuildInputs
     ++ optional  ibusSupport ibus
-    ++ optionals stdenv.isDarwin [ AudioUnit Cocoa CoreAudio CoreServices ForceFeedback OpenGL ];
+    ++ optionals stdenv.isDarwin [
+      AudioUnit Cocoa CoreAudio CoreServices ForceFeedback OpenGL
+      # Needed for NSDefaultRunLoopMode symbols.
+      cf-private
+    ];
 
   # /build/SDL2-2.0.7/src/video/wayland/SDL_waylandevents.c:41:10: fatal error:
   #   pointer-constraints-unstable-v1-client-protocol.h: No such file or directory