recently most of the i have to load libxcb-dev for configure scripts to find gtk2, digging in the problem i have found this
pkg-config --libs x11
Package xcb was not found in the pkg-config search path.
Perhaps you should add the directory containing `xcb.pc'
to the PKG_CONFIG_PATH environment variable
Package 'xcb', required by 'X11', not found
i am trying to find which one really misses libxcb-dev, is it Xorg-7.5-dev ??