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-rw-r--r--libaf/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/libaf/Makefile b/libaf/Makefile
index 5d11fc71fb..1494c36d2e 100644
--- a/libaf/Makefile
+++ b/libaf/Makefile
@@ -9,7 +9,7 @@ af_lavcresample.c af_sweep.c af_hrtf.c format.c af_center.c $(OPTIONAL_SRCS)
OBJS=$(SRCS:.c=.o)
-CFLAGS = $(OPTFLAGS) -I. -Wall $(EXTRA_INC)
+CFLAGS = $(OPTFLAGS) -I. -Wall $(EXTRA_INC) -D_GNU_SOURCE
ifeq ($(TARGET_OS),MINGW32)
CFLAGS += -D_IO_H_