Fix the build with cups < 2.3
authorMatthias Clasen <mclasen@redhat.com>
Fri, 31 Jul 2020 14:00:20 +0000 (10:00 -0400)
committerMatthias Clasen <mclasen@redhat.com>
Fri, 31 Jul 2020 14:01:45 +0000 (10:01 -0400)
commitd761e3cf2c31b91269a3dbfd64a553decdeec51c
tree9d6512032b076907e5402e600f1a6ae9b2501651
parent360ffb8e87608f1b26f5eb4bdc2ab32b036d61d0
Fix the build with cups < 2.3

PPD_CUSTOM_UNKNOWN was introduced in cups 2.3.
Only handle it when we build against a new enough cups.

Fixes: #2968
modules/printbackends/gtkprintbackendcups.c