looks like pstoedit is needed too

jakebeal · jakebeal · commit 29df1f5107df · 2019-09-11T09:31:45.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -14,6 +14,7 @@ addons:
   apt:
     packages:
       - ghostscript
+      - pstoedit
 env:
  global:
     - OCTAVE=octave
