Add a "fork" of musl as //fusl.

fusl/include/assert.h

Index: fusl/include/assert.h
diff --git a/fusl/include/assert.h b/fusl/include/assert.h
new file mode 100644
index 0000000000000000000000000000000000000000..1ee02a4a5fb095d0cffacba1cc05a36a94633138
--- /dev/null
+++ b/fusl/include/assert.h
@@ -0,0 +1,23 @@
+#include <features.h>
+
+#undef assert
+
+#ifdef NDEBUG
+#define	assert(x) (void)0
+#else
+#define assert(x) ((void)((x) || (__assert_fail(#x, __FILE__, __LINE__, __func__),0)))
+#endif
+
+#ifndef __cplusplus
+#define static_assert _Static_assert
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void __assert_fail (const char *, const char *, int, const char *);
+
+#ifdef __cplusplus
+}
+#endif