I'm working on porting a gtk software program that runs on linux/windows to MAC OS X. The prior release of my software works fine on Mac (Tiger) with the X11 server. I'm trying the native port. I was able to build my Gtk development environment up to gtk-2.8.20 version ( glib, pango, cairo, atk, etc all installed "ok" ). But when I go to configure gtk, I get the error: X development libraries not found. I removed all X11 packages to try building a vanilla native Mac devel env.