diff --git a/examples/Makefile-gp712 b/examples/Makefile-gp712
index f111e5a1c..ad088805d 100644
--- a/examples/Makefile-gp712
+++ b/examples/Makefile-gp712
@@ -81,6 +81,8 @@ CPPFLAGS                       += \
 
 CFLAGS                         += \
     $(COMMONCFLAGS)               \
+    -D_BSD_SOURCE=1               \
+    -D_DEFAULT_SOURCE=1           \
     $(target_CFLAGS)              \
     $(NULL)