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-rw-r--r--frontends/gtk/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/frontends/gtk/Makefile b/frontends/gtk/Makefile
index c19720f94..72d748362 100644
--- a/frontends/gtk/Makefile
+++ b/frontends/gtk/Makefile
@@ -37,6 +37,7 @@ GTKCFLAGS := -std=c99 -Dgtk -Dnsgtk -g \
$(GTKDEPFLAGS) \
-D_BSD_SOURCE \
-D_DEFAULT_SOURCE \
+ -D_XOPEN_SOURCE=700 \
-D_POSIX_C_SOURCE=200809L \
-D_NETBSD_SOURCE \
-DGTK_RESPATH=\"$(NETSURF_GTK_RES_PATH)\"