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Otherwise will not the gdk-pixbuf-xlib.h be installed.
http://comments.gmane.org/gmane.linux.lfs.beyond.support/43641

otherwise will some packages. like gtk-vnc fail to build.
https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=613466

fixes #1115

not really needed

fixes #700

Ref #1054 - this hopefully fixes the bug, but further testing is
needed to verify it. Valgrind traces look optimistic.

Fix authored by me; and reported also to upstream:
http://bugs.squid-cache.org/show_bug.cgi?id=3537