PostScript files that go in $(POSTLIB). Several, like forms.ps, are
used by most translators supplied in this package. Most PostScript
files only used by a single translator (e.g. the prologue) have been 
been moved into the appropriate source directory. Files that end in
.enc support alternate character sets (e.g. ISO Latin 1 alphabet).
The implementation is left open, but typically redefines findfont.
That approach works because findfont is a procedure rather than an
operator, so it's not affected by bind. Also can't depend on having
a systemdict definition for findfont. It's in userdict on Version
48.0 VT600s.