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-rw-r--r--hdlcutil/fl/Makefile.am2
1 files changed, 1 insertions, 1 deletions
diff --git a/hdlcutil/fl/Makefile.am b/hdlcutil/fl/Makefile.am
index f0c7979..1b2abfc 100644
--- a/hdlcutil/fl/Makefile.am
+++ b/hdlcutil/fl/Makefile.am
@@ -3,7 +3,7 @@ if HAVE_FLTK
sbin_PROGRAMS = xfsmmixer xfhdlcchpar xfhdlcst xfsmdiag
endif
-AM_CPPFLAGS = $(X_CFLAGS) -I$(srcdir)/..
+AM_CPPFLAGS = -D_GNU_SOURCE $(X_CFLAGS) -I$(srcdir)/..
LDADD = ../hdrvcomm.o $(X_LIBS) -lX11 $(FLTK_LIB) $(LDDADD)
xfsmmixer_SOURCES = xfsmmixer.cxx xfsmmixer_main.cxx xfsmmixer.h