smithj@ichigo pkgconfig $  cat gtk+-2.0.pc                                                                   
prefix=/usr
exec_prefix=/usr
libdir=/usr/lib
includedir=/usr/include
target=x11

gtk_binary_version=2.10.0
gtk_host=i386-unknown-linux-gnu

Name: GTK+
Description: GIMP Tool Kit (${target} target)
Version: 2.10.9
Requires: gdk-${target}-2.0 atk cairo
Libs: -L${libdir} -lgtk-${target}-2.0 
Cflags: -I${includedir}/gtk-2.0 
smithj@ichigo pkgconfig $  pkg-config --libs gtk+-2.0                                                        
-lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lpango-1.0 -lcairo -lm -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0 -lfreetype -lz -lfontconfig -lexpat -lpng12 -lXrender -lX11 -lpthread