Gtk2::GLext install

Ok, I wanted to have
gtkglext
gtkglextmm
Gtk2::GLext all installed.
let us get latest one of them all
first two use
./configure --prefix=/usr
to get to right debian locations
then for the last guy
need to edit Makefile.PL
to move line
mkdir 'build', 0777;
above the line for the pod that enables compilation
got 2 errors
unrecognized argument in LIBS ignored: '-Wl, --export-dynamic'
unrecognized argument in LIBS ignored: '-pthread'
then did make
make test
make install