plan9's ghostscript

gistfile1.txt

term% pwd
/sys/src/cmd/gs/lib
term% gs /sys/doc/auth.ps
AFPL Ghostscript 8.53 (2005-10-20)
Copyright (C) 2005 artofcode LLC, Benicia, CA.  All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Can't find (or can't open) font file s050000l.pfb.
Can't find (or can't open) font file /sys/lib/Resource/Font/StandardSymL.
Can't find (or can't open) font file StandardSymL.
Can't find (or can't open) font file /sys/lib/Resource/Font/StandardSymL.
Can't find (or can't open) font file StandardSymL.
Querying operating system for font files...
Didn't find this font on the system!
Substituting font Courier for StandardSymL.
Can't find (or can't open) font file n022003l.pfb.
Can't find (or can't open) font file /sys/lib/Resource/Font/NimbusMonL-Regu.
Can't find (or can't open) font file NimbusMonL-Regu.
Can't find (or can't open) font file /sys/lib/Resource/Font/NimbusMonL-Regu.
Can't find (or can't open) font file NimbusMonL-Regu.
Didn't find this font on the system!
Unable to substitute for font.
Error: /invalidfont in findfont
Operand stack:
   Symbol   Symbol   Symbol   Font   Symbol   434604   Symbol   --nostringval--   Symbol   StandardSymL   Courier   NimbusMonL-Regu
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1   3   %oparray_pop   1   3   %oparray_pop   1   3   %oparray_pop   1   3   %oparray_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   --nostringval--   --nostringval--   --nostringval--   3   3   %oparray_pop   4   3   %oparray_pop   --nostringval--   --nostringval--   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   7   4   %oparray_pop   --nostringval--   --nostringval--   --nostringval--   1   -1   1   --nostringval--   %for_neg_int_continue
Dictionary stack:
   --dict:1119/1686(ro)(G)--   --dict:0/20(G)--   --dict:161/200(L)--   --dict:17/17(ro)(G)--   --dict:1119/1686(ro)(G)--
Current allocation mode is local
Last OS error: 20
Current file position is 213728
AFPL Ghostscript 8.53: Unrecoverable error, exit code 1