Merge pull request #16358 from timbertson/tk

tk: propagate dependency on tcl & libXft

pkgs/development/libraries/tk/generic.nix

@@ -17,9 +17,11 @@ stdenv.mkDerivation {
     "--with-tcl=${tcl}/lib"
   ];
 
-  buildInputs = [ pkgconfig tcl libXft ]
+  buildInputs = [ pkgconfig ]
     ++ stdenv.lib.optional stdenv.isDarwin fontconfig;
 
+  propagatedBuildInputs = [ tcl libXft ];
+
   NIX_CFLAGS_LINK = if stdenv.isDarwin then "-lfontconfig" else null;
 
   inherit tcl;