cairo: force enable xlib, and add a missing PKGCONFIG-PATH

component/gtk-2/buildout.cfg

@@ -20,9 +20,10 @@ url = http://cairographics.org/releases/cairo-1.10.2.tar.gz
 md5sum = f101a9e88b783337b20b2e26dfd26d5f
 configure-options = 
   --enable-tee=yes
+  --enable-xlib=yes
 environment = 
   PATH=${freetype:location}/bin:${pkgconfig:location}/bin:%(PATH)s
-  PKG_CONFIG_PATH=${fontconfig:location}/lib/pkgconfig:${freetype:location}/lib/pkgconfig:${zlib:location}/lib/pkgconfig:${libpng:location}/lib/pkgconfig:${pixman:location}/lib/pkgconfig:${libX11:location}/lib/pkgconfig:${libXrender:location}/lib/pkgconfig:${glib:location}/lib/pkgconfig:{gettext:location}/lib/pkgconfig
+  PKG_CONFIG_PATH=${fontconfig:location}/lib/pkgconfig:${freetype:location}/lib/pkgconfig:${zlib:location}/lib/pkgconfig:${libpng:location}/lib/pkgconfig:${pixman:location}/lib/pkgconfig:${libX11:location}/lib/pkgconfig:${libXrender:location}/lib/pkgconfig:${glib:location}/lib/pkgconfig:{gettext:location}/lib/pkgconfig:${libxcb:location}/lib/pkgconfig
   CPPFLAGS=-I${libpng:location}/include/ -I${zlib:location}/include -I${libX11:location}/include/ -I${xproto:location}/include -I${kbproto:location}/include -I${libXrender:location}/include -I${render:location}/include -I${gettext:location}/include
   LDFLAGS=-L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${libXrender:location}/lib -Wl,-rpath=${libXrender:location}/lib -L${gettext:location}/lib -Wl,-rpath=${gettext:location}/lib
   LD_LIBRARY_PATH=${render:location}/lib:${libX11:location}/lib:${libXrender:location}/lib