diff --git a/scripts/grab-upstream.sh b/scripts/grab-upstream.sh
index 00c35dd8f..f1f845e9d 100755
--- a/scripts/grab-upstream.sh
+++ b/scripts/grab-upstream.sh
@@ -51,6 +51,9 @@ if test -n "$(git status --porcelain)"; then
     echo "  2. Run scripts/grab-upstream.sh from the top-level directory"
     echo "  3. Submit the result as a pull request"
     echo
+    echo "If you must apply patches, please do it in grab-upstream.sh so that"
+    echo "these patches are described programmatically."
+    echo
   } 1>&2
   exit 1
 fi
diff --git a/v3.2/glfw/glfw/src/wl_window.c b/v3.2/glfw/glfw/src/wl_window.c
index 6abc5a4dd..cf75ec828 100644
--- a/v3.2/glfw/glfw/src/wl_window.c
+++ b/v3.2/glfw/glfw/src/wl_window.c
@@ -24,6 +24,8 @@
 //
 //========================================================================
 
+#define _GNU_SOURCE
+
 #include "internal.h"
 
 #include <stdio.h>