--- /dev/null
+++ Libc/Libc-1534.81.1/tests/os_string_include.c
@@ -0,0 +1,7 @@
+#include <os/string.h>
+#include <darwintest.h>
+
+T_DECL(os_string_include_test, "Make sure we can use os/string.h by itself") {
+	const char *result = strerror_np(1);
+	T_EXPECT_NOTNULL(result, "strerror_np doesn't work on EPERM!");
+}