package's prefix would not work as part of the environment specification
via MAKE_ENV (as it would not be executed in the correct directory).
Fix this by invoking pkg_info(1) directly, not via an intermediate make(1)
step - this is not as clean, but more effective (i.e. it works).
a bit more user-friendly.
Introduce a show-{gtk+,imlib,kdebase,qt1,qt2,xpm}-prefix target in
bsd.pkg.mk, and use "${MAKE} show-*-prefix" in package Makefiles.
components. This allows users of Qt to specify QTDIR=/path/to/qt instead
of having to patch all configure scripts and makefiles to look for alternate
names. This is the recommended approach from Troll Tech (Qt authors).
update pkgs which use qt1 to reflect this.
