See the "[1]" at the end of this line you posted:
[ebuild R *] dev-libs/glib-9999 USE="static-libs -debug -doc -fam (-introspection) (-selinux) -test -xattr" 0 kB [1] That means this ebuilds come from an overlay, so it's your responsibility to look over it. -- Jesús Guerrero Botella