compile		- used only during setup to compile a2ps in aps/src/...

mksymlinks	- used only during setup to make needed symlinks from
		  aps/bin/apsfilter to aps/filter/a2ps-xxx-yyy-zzz

filtersetup	- usually needed only during installation (SETUP)
		  builds a filter_found database, that is needed
		  during apsfilter runtime to device, if we have
		  needed filters to print a file or not.

		  !!! If you add new filters to your system that are    !!!
		  !!! supported by apsfilter, then you have to run this !!!
		  !!! program, to rebuild the filters_found database    !!!
