A simple program that scans PostScript files for %%DocumentFonts:
comments and prepends requested host resident font files to the
input. Written for Unix 4.0 lp.

Downloaded fonts are the ones named in the %%DocumentFonts: comment
and listed in a special map file (which can be selected using the
-m option). See example.map and comments in download.c for examples
of map files. By default map files and font files are in *hostfontdir.
It's initialized using HOSTDIR (file ../common/path.h).