--- knxd-0.14.75.orig/src/client/ruby/Makefile.am	2026-01-08 17:37:44.000000000 +0100
+++ knxd-0.14.75/src/client/ruby/Makefile.am	2026-05-25 04:04:33.614220897 +0200
@@ -1,4 +1,5 @@
 CC = $(CC_FOR_BUILD)
+CFLAGS = $(CFLAGS_FOR_BUILD)
 LIBS = $(LIBS_FOR_BUILD)
 EXEEXT = $(EXEEXT_FOR_BUILD)
 
