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-rw-r--r--utils/Makefile.am2
1 files changed, 1 insertions, 1 deletions
diff --git a/utils/Makefile.am b/utils/Makefile.am
index cca00c2..75e452c 100644
--- a/utils/Makefile.am
+++ b/utils/Makefile.am
@@ -2,7 +2,7 @@ MAINTAINERCLEANFILES = Makefile.in
ACLOCAL_AMFLAGS = -I m4
-AM_CFLAGS = -I${top_srcdir}/include
+AM_CFLAGS = -I${top_srcdir}/include -D_GNU_SOURCE
ndptool_LDADD = $(top_builddir)/libndp/libndp.la