I can also confirm this bug in testing (Stretch). xpdf version 3.04-4
Apparently the bug is similar to the bug 640162 ( https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=640162)
- Bug#848671: xpdf: Many errors "Config Error: Unknown ... Vincent Lefevre
- Bug#848671: xpdf: Many errors "Config Error: Unk... Luis Mochan
- Bug#848671: xpdf: Many errors "Config Error: Unk... John Lawless
- Bug#848671: xpdf: Many errors "Config Error: Unk... Joao Borges
- Bug#848671: xpdf: Many errors "Config Error: Unk... alsauser
