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

fusl/include/ftw.h

Index: fusl/include/ftw.h
diff --git a/fusl/include/ftw.h b/fusl/include/ftw.h
new file mode 100644
index 0000000000000000000000000000000000000000..c8eadbc9dda723eaa5d7c6ef486365a1565ca874
--- /dev/null
+++ b/fusl/include/ftw.h
@@ -0,0 +1,42 @@
+#ifndef _FTW_H
+#define	_FTW_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+#include <sys/stat.h>
+
+#define FTW_F   1
+#define FTW_D   2
+#define FTW_DNR 3
+#define FTW_NS  4
+#define FTW_SL  5
+#define FTW_DP  6
+#define FTW_SLN 7
+
+#define FTW_PHYS  1
+#define FTW_MOUNT 2
+#define FTW_CHDIR 4
+#define FTW_DEPTH 8
+
+struct FTW
+{
+	int base;
+	int level;
+};
+
+int ftw(const char *, int (*)(const char *, const struct stat *, int), int);
+int nftw(const char *, int (*)(const char *, const struct stat *, int, struct FTW *), int, int);
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define ftw64 ftw
+#define nftw64 nftw
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif