SDL_mixer: enable mikmod support

pkgs/development/libraries/SDL_mixer/default.nix

@@ -1,4 +1,8 @@
-{ stdenv, lib, fetchurl, SDL, libogg, libvorbis, smpeg, enableNativeMidi ? false, fluidsynth ? null }:
+{ stdenv, lib, fetchurl
+, SDL, libogg, libvorbis, smpeg, libmikmod
+, fluidsynth
+, enableNativeMidi ? false
+}:
 
 stdenv.mkDerivation rec {
   pname   = "SDL_mixer";
@@ -9,9 +13,9 @@ stdenv.mkDerivation rec {
     sha256 = "0alrhqgm40p4c92s26mimg9cm1y7rzr6m0p49687jxd9g6130i0n";
   };
 
-  buildInputs = [ SDL libogg libvorbis fluidsynth smpeg ];
+  buildInputs = [ SDL libogg libvorbis fluidsynth smpeg libmikmod ];
 
-  configureFlags = [ "--disable-music-ogg-shared" ]
+  configureFlags = [ "--disable-music-ogg-shared" "--disable-music-mod-shared" ]
     ++ lib.optional enableNativeMidi " --enable-music-native-midi-gpl"
     ++ lib.optionals stdenv.isDarwin [ "--disable-sdltest" "--disable-smpegtest" ];