FindX11: Add xcb_util and xcb_xfixes libraries
provide the libraries equivalent to the debian packages libxcb-xfixes0-dev and libxcb-util0-dev
Topic-rename: FindX11-xcb-util-xfixes
Edited by Brad King
provide the libraries equivalent to the debian packages libxcb-xfixes0-dev and libxcb-util0-dev
Topic-rename: FindX11-xcb-util-xfixes