===>  Checking files for python-2.5c2
`/usr/ports/distfiles/Python-2.5c2.tgz' is up to date.
>> Checksum OK for Python-2.5c2.tgz. (sha1)
===>  python-2.5c2 depends on: tk-8.4.7 - not found
===>  Verifying install for tk-8.4.7 in x11/tk/8.4
===>  tk-8.4.7 uses X11, but /usr/X11R6 not found.
===> Returning to build of python-2.5c2
===>  python-2.5c2 depends on: tk-8.4.7 - not found
===>  Verifying install for tk-8.4.7 in x11/tk/8.4
===>  tk-8.4.7 uses X11, but /usr/X11R6 not found.
===> Returning to build of python-2.5c2
Dependency check failed
*** Error code 1

Stop in /usr/ports/lang/python/2.5 (line 1422 of /usr/ports/infrastructure/mk/bsd.port.mk).
*** Error code 1

Stop in /usr/ports/lang/python/2.5 (line 1750 of /usr/ports/infrastructure/mk/bsd.port.mk).