--- nss-3.15.1/nss/lib/dbm/config/config.mk.orig
+++ nss-3.15.1/nss/lib/dbm/config/config.mk
@@ -25,7 +25,7 @@
 DEFINES += -DHAVE_SNPRINTF
 endif
 
-ifeq (,$(filter-out IRIX Linux,$(OS_TARGET)))
+ifneq ($(wildcard /usr/include/sys/cdefs.h),)
 DEFINES += -DHAVE_SYS_CDEFS_H
 endif