developer will need to build and install these separately if they
don't have packages already installed by their system. See
README.metakit and README.zlib for more details.
As a convenience, pristine tarballs of the metakit and zlib source
code trees are included with the simgear distribution (and cvs.)
it is only built if it doesn't already exist on the user's platform.
gdbm is a set of database routines that use extendible hashing and works
similar to the standard UNIX dbm routines. This guarantees the availability
of gdbm to any application that uses SimGear.
