示例 pkg_setup
pkg_setup() {
We need to know which GUI we're building in several
different places, so work it out here.
if use gtk ; then
if use gtk2 ; then
export mypkg_gui="gtk2"
else
export mypkg_gui="gtk1"
fi
elif use motif then
export mypkg_gui="motif"
else
export mypkg_gui="athena"
fi
}