Currently, jhbuild-ing GTK+ on Ubuntu 14.04 LTS and gcc 4.8.2 errors out with
	/usr/bin/ld: encodesymbolic.o: undefined reference to symbol 'g_file_new_for_path'
	/opt/gnome/lib/libgio-2.0.so.0: error adding symbols: DSO missing from command line
when trying to build gtk-encode-symbolic-svg. This is because $(GTK_DEP_LIBS) isn't defined in $(gtk_encode_symbolic_svg_LDADD) in gtk/Makefile.am. This patch should fix that.

Thanks to b4n and gregier in irc.gimp.net/#gtk+ for help.

https://bugzilla.gnome.org/show_bug.cgi?id=734201