When building aterm or rxvt (and other packages using xpm or xpm itself),
xpm fails with:

===> Buildlinking for xpm-3.4knb1
make: don't know how to make _BUILDLINK_USE. Stop

make: stopped in /usr/pkgsrc/graphics/xpm
*** Error code 2


(I do have slight changes to bsd.buildlink{2,3}.mk to use xlibs instead of
x11-links, but it has worked fine for building gtk, dillo, manedit
and manwrap, and xjed)

   Jeremy C. Reed
   http://bsd.reedmedia.net/