--- Makefile.orig	2016-11-23 12:27:46 UTC
+++ Makefile
@@ -66,7 +66,7 @@ CDEBUG		=	-g
 #<<lint flags of choice?>>
 LINTFLAGS	=	-hbxa $(INCLUDE) $(DEBUGGING)
 #<<want to use a nonstandard CC?>>
-CC		=	gcc -Wall -Wno-unused -Wno-comment
+CC		+=	-Wall -Wno-unused -Wno-comment
 #<<manifest defines>>
 DEFS		=
 #(SGI IRIX systems need this)
@@ -79,7 +79,7 @@ LDFLAGS		=
 #################################### end configurable stuff
 
 SHELL		=	/bin/sh
-CFLAGS		=	$(CDEBUG) $(INCLUDE) $(DEFS)
+CFLAGS		+=	$(INCLUDE) $(DEFS)
 
 INFOS		=	README CHANGES FEATURES INSTALL CONVERSION THANKS MAIL
 MANPAGES	=	bitstring.3 crontab.5 crontab.1 cron.8 putman.sh