Doing things like <snip> -DG_DISABLE_DEPRECATED -DGDK_PIXBUF_DISABLE_DEPRECATED -DGDK_DISABLE_DEPRECATED -DGTK_DISABLE_DEPRECATED -DPANGO_DISABLE_DEPRECATED </snip> just calls for borkage sooner or later, really bad idea. See Bug 193369 Comment #1 and pass this upstream please. Thanks.
Upstream done: http://bugzilla.gnome.org/show_bug.cgi?id=483919
"This is bogus. We have configure checks for this and turn off the deprecation guards if you are compiling GIMP with newer versions of these libraries. Please do some research before filing a bug report. You are wasting our time." Cite from upstream.