gst-plugins-base 1.x: fix Darwin build

pkgs/development/libraries/gstreamer/base/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchurl, pkgconfig, python, gstreamer, gobjectIntrospection
 , orc, alsaLib, libXv, pango, libtheora
-, cdparanoia, libvisual
+, cdparanoia, libvisual, libintlOrEmpty
 }:
 
 stdenv.mkDerivation rec {
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     description = "Base plugins and helper libraries";
     homepage = "http://gstreamer.freedesktop.org";
     license = stdenv.lib.licenses.lgpl2Plus;
-    platforms = stdenv.lib.platforms.linux;
+    platforms = stdenv.lib.platforms.unix;
     maintainers = with stdenv.lib.maintainers; [ iyzsong ];
   };
 
@@ -24,12 +24,23 @@ stdenv.mkDerivation rec {
   ];
 
   buildInputs = [
-    orc alsaLib libXv pango libtheora
-    cdparanoia libvisual
-  ];
+    orc libXv pango libtheora cdparanoia
+  ]
+  ++ libintlOrEmpty
+  ++ stdenv.lib.optional stdenv.isLinux alsaLib
+  ++ stdenv.lib.optional (!stdenv.isDarwin) libvisual;
 
   propagatedBuildInputs = [ gstreamer ];
 
+  configureFlags = if stdenv.isDarwin then [ 
+    # Does not currently build on Darwin
+    "--disable-libvisual"
+    # Undefined symbols _cdda_identify and _cdda_identify_scsi in cdparanoia
+    "--disable-cdparanoia"
+  ] else null;
+
+  NIX_LDFLAGS = if stdenv.isDarwin then "-lintl" else null;
+
   enableParallelBuilding = true;
 }