cairomm: fix on darwin

pkgs/development/libraries/cairomm/default.nix

···
-{ fetchurl, stdenv, pkgconfig, cairo, xlibsWrapper, fontconfig, freetype, libsigcxx }:
+{ fetchurl, stdenv, pkgconfig, darwin, cairo, xlibsWrapper, fontconfig, freetype, libsigcxx }:
 let
   ver_maj = "1.12";
   ver_min = "0";
···
 
   nativeBuildInputs = [ pkgconfig ];
   propagatedBuildInputs = [ cairo libsigcxx ];
-  buildInputs = [ fontconfig freetype ];
+  buildInputs = [ fontconfig freetype ]
+  ++ stdenv.lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
+    ApplicationServices
+  ]);
 
   doCheck = true;
 
···
     homepage = http://cairographics.org/;
 
     license = with licenses; [ lgpl2Plus mpl10 ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }