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

fusl/include/sys/statvfs.h

+#ifndef _SYS_STATVFS_H
+#define _SYS_STATVFS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+
+#define __NEED_fsblkcnt_t
+#define __NEED_fsfilcnt_t
+#include <bits/alltypes.h>
+
+#include <endian.h>
+
+struct statvfs {
+        unsigned long f_bsize, f_frsize;
+        fsblkcnt_t f_blocks, f_bfree, f_bavail;
+        fsfilcnt_t f_files, f_ffree, f_favail;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+        unsigned long f_fsid;
+        unsigned :8*(2*sizeof(int)-sizeof(long));
+#else
+        unsigned :8*(2*sizeof(int)-sizeof(long));
+        unsigned long f_fsid;
+#endif
+        unsigned long f_flag, f_namemax;
+        int __reserved[6];
+};
+
+int statvfs (const char *__restrict, struct statvfs *__restrict);
+int fstatvfs (int, struct statvfs *);
+
+#define ST_RDONLY 1
+#define ST_NOSUID 2
+#define ST_NODEV  4
+#define ST_NOEXEC 8
+#define ST_SYNCHRONOUS 16
+#define ST_MANDLOCK    64
+#define ST_WRITE       128
+#define ST_APPEND      256
+#define ST_IMMUTABLE   512
+#define ST_NOATIME     1024
+#define ST_NODIRATIME  2048
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define statvfs64 statvfs
+#define fstatvfs64 fstatvfs
+#define fsblkcnt64_t fsblkcnt_t
+#define fsfilcnt64_t fsfilcnt_t
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif