diff --git a/pkgs/development/libraries/tk/default.nix b/pkgs/development/libraries/tk/default.nix
index c7fe3e105d8..2757a254385 100644
--- a/pkgs/development/libraries/tk/default.nix
+++ b/pkgs/development/libraries/tk/default.nix
@@ -1,25 +1,26 @@
-{ stdenv, fetchurl, pkgconfig, tcl, libXft }:
+{ stdenv, fetchurl, pkgconfig, tcl, libXft, fontconfig }:
 
 stdenv.mkDerivation {
   name = "tk-8.5.15";
-  
+
   src = fetchurl {
     url = "mirror://sourceforge/tcl/tk8.5.15-src.tar.gz";
     sha256 = "0grj0k0hljvwiz913pafqibz18fzk9xjxf0nzqrd9zdls036fp41";
   };
 
   patches = [ ./different-prefix-with-tcl.patch ];
-  
+
   postInstall = ''
     ln -s $out/bin/wish* $out/bin/wish
   '';
-  
+
   configureFlags = "--with-tcl=${tcl}/lib";
-  
+
   preConfigure = "cd unix";
 
-  buildInputs = [ pkgconfig tcl libXft ];
-  
+  buildInputs = [ pkgconfig tcl libXft ]
+    ++ stdenv.lib.optional stdenv.isDarwin fontconfig;
+
   inherit tcl;
 
   passthru = {