The linux-gtk port sets USE_LINUX_PREFIX which adds a dependency
on linux_base 7.1, but the latter port has its own XFree86 libraries
which conflict with the ones from this port. The rpm2cpio (used
in pre-install) and rpm (used in do-install) ports conflict with
each other. Fix the dependencies by bringing in parts of the
linux-gtk Makefile so this port can stand on its own, and by using
the rpm2cpio that accompanies rpm.
While I'm here, be less verbose, reorder some lines to please
portlint, and slim the pre-install a little.
Approved by: portmgr (marcus) for 5.2 freeze