Fix the build with cups < 2.2.12
authorThomas Lange <thomas-lange2@gmx.de>
Sat, 24 Oct 2020 11:16:40 +0000 (13:16 +0200)
committerThomas Lange <thomas-lange2@gmx.de>
Mon, 26 Oct 2020 18:16:26 +0000 (19:16 +0100)
commit0493e89897cab9d8d50c3c1297c346dc4c384907
treeabe561fe71fc07fe760faa924802e8ac8912170e
parent4661f15fab67750edfb6c233657b523984068cf3
Fix the build with cups < 2.2.12

PPD_CUSTOM_UNKNOWN was introduced in cups 2.3.
and has been backported to 2.2.12.
Only handle it when we build against a new enough cups.

Fixes: #2968
modules/printbackends/gtkprintbackendcups.c