1 files changed, 9 insertions, 0 deletions
diff --git a/build/flags/Wundef-prefix.c b/build/flags/Wundef-prefix.c
new file mode 100644
index 0000000..3eaf82b
--- /dev/null
+++ b/build/flags/Wundef-prefix.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CPPFLAGS += -Wundef-prefix=BFS_
+/// -Werror
+
+int main(void) {
+	return 0;
+}