Port dosbox is missing a dependency for glu:
prt-get: installing /usr/ports/opt/dosbox
prt-get: starting build Wed Apr 3 22:29:39 2013
=======> Downloading 'http://download.sourceforge.net/dosbox/dosbox-0.74.tar.gz'.
[snip]
In file included from sdlmain.cpp:58:0:
/usr/include/SDL/SDL_opengl.h:47:58: fatal error: GL/glu.h: No such file or directory
compilation terminated.
make[3]: *** [sdlmain.o] Error 1
make[3]: *** Waiting for unfinished jobs....
mv -f .deps/render.Tpo .deps/render.Po
mv -f .deps/sdl_mapper.Tpo .deps/sdl_mapper.Po
make[3]: Leaving directory `/usr/ports/opt/dosbox/work/src/dosbox-0.74/src/gui'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/usr/ports/opt/dosbox/work/src/dosbox-0.74/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/ports/opt/dosbox/work/src/dosbox-0.74'
make: *** [all] Error 2
=======> ERROR: Building '/usr/ports/opt/dosbox/dosbox#0.74-1.pkg.tar.gz' failed.
# prt-get info dosbox
Name: dosbox
Path: /usr/ports/opt
Version: 0.74
Release: 1
Description: SDL-based DOS emulator for classic games
URL:
http://dosbox.sourceforge.net
Packager: Tilman Sauerbeck, tilman at crux dot nu
Maintainer: Alan Mizrahi, alan at mizrahi dot com dot ve
Dependencies: libsdl