Replace the occurrences of /usr/X11R6 with ${X11BASE} in games/noegnud-nethack, games/noegnud-slashem, games/noegnud-littlehack, and games/noegnud-nethack-deet as pointed out by kris@. Not bumping PORTREVISION as this does not affact any successfully built packages. Compilation fails for people suffering from this problem.
State Changed From-To: open->closed Committed, thanks!