Why don't you use DEB_CFLAGS_MAINT_APPEND to add -std=gnu17?
- Bug#1115314: RFS: xsane/0.999-13 [RC] -- featureful gr... Jörg Frings-Fürst
- Bug#1115314: RFS: xsane/0.999-13 [RC] -- featuref... Bastian Germann
- Bug#1115314: RFS: xsane/0.999-13 [RC] -- feat... Hilmar Preusse
- Bug#1115314: RFS: xsane/0.999-13 [RC] -- featuref... Bastian Germann

