Per mk-configure(7), Makefiles should use CFLAGS0 and CPPFLAGS0 for their
own flags. This allows setting CFLAGS and CPPFLAGS ourselves during the build
without clobbering important settings/definitions like MAA_MAJOR.
--- a/maa/Makefile
+++ b/maa/Makefile
@@ -22,11 +22,11 @@ arg.o arg.os: ${.OBJDIR}/arggram.c arg.c
 ${.OBJDIR}/arggram.c: arggram.txt
 	awk -f ${SRCDIR_maa}/arggram2c < ${SRCDIR_maa}/arggram.txt > $@
 
-CFLAGS +=	-DMAA_MAJOR=${MAA_MAJOR}
-CFLAGS +=	-DMAA_MINOR=${MAA_MINOR}
-CFLAGS +=	-DMAA_TEENY=${MAA_TEENY}
+CFLAGS0 +=	-DMAA_MAJOR=${MAA_MAJOR}
+CFLAGS0 +=	-DMAA_MINOR=${MAA_MINOR}
+CFLAGS0 +=	-DMAA_TEENY=${MAA_TEENY}
 
-CPPFLAGS +=	-I. -I${.OBJDIR}
+CPPFLAGS0 +=	-I. -I${.OBJDIR}
 
 #MAN =		maa.1