Index: head/libexec/dma/Makefile.inc
===================================================================
--- head/libexec/dma/Makefile.inc	(revision 297326)
+++ head/libexec/dma/Makefile.inc	(revision 297327)
@@ -1,13 +1,13 @@
 # $FreeBSD$
 
 .sinclude "${.CURDIR}/../../Makefile.inc"
 DMA_SOURCES=	${.CURDIR}/../../../contrib/dma
 .PATH:	${DMA_SOURCES}
 
-CFLAGS=	-I${DMA_SOURCES} \
+CFLAGS+= -I${DMA_SOURCES} \
 	-DHAVE_REALLOCF -DHAVE_STRLCPY -DHAVE_GETPROGNAME \
 	-DCONF_PATH='"/etc/dma"' \
 	-DLIBEXEC_PATH='"/usr/libexec"' -DDMA_VERSION='"v0.10"' \
 	-DDMA_ROOT_USER='"mailnull"' \
 	-DDMA_GROUP='"mail"'
 BINGRP=	mail