--- cl-original/makefile	2019-03-10 11:50:35.325298573 +0100
+++ cl-patched/makefile	2019-03-10 11:53:03.663407724 +0100
@@ -90,7 +90,7 @@
 # Further cc flags are gathered dynamically at runtime via the ccopts.sh
 # script.
 
-CFLAGS			= -c -D__UNIX__ -DNDEBUG -I.
+CFLAGS			= -c -D__UNIX__ -DNDEBUG -I. $(ADDFLAGS)
 CFLAGS_DEBUG	= -c -D__UNIX__ -I. -g -O1
 CFLAGS_DEBUGGCC	= -c -D__UNIX__ -I. -ggdb3 -fno-omit-frame-pointer -O1
 CFLAGS_ANALYSE	= -c -D__UNIX__ -I.