libarchive: use -isystem for /usr/include

	. 'fixes' warnings that are in these headers, but normally aren't
	   emited as they're system headers

Change-Id: Ibd20343eae51770cef71116bbda0d9141441ec54

diff --git a/external/bsd/libarchive/Makefile.inc b/external/bsd/libarchive/Makefile.inc
index 4fcf7db2ed0446be0ed335bff75702136b7e7acb..12dc916061c337828806e74397b7f273af288e83 100644 (file)
--- a/external/bsd/libarchive/Makefile.inc
+++ b/external/bsd/libarchive/Makefile.inc
@@ -7,7 +7,7 @@ USE_FORT?=      yes # complex string handling
 LIBARCHIVEDIR= ${NETBSDSRCDIR}/external/bsd/libarchive/dist
 
 .if defined(__MINIX)
-CPPFLAGS+=     -I${DESTDIR}/usr/include
+CPPFLAGS+=     -isystem ${DESTDIR}/usr/include
 .endif
 CPPFLAGS+=     -I${NETBSDSRCDIR}/external/bsd/libarchive/include
 CPPFLAGS+=     -DPLATFORM_CONFIG_H=\"config_netbsd.h\"