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

fusl/include/dirent.h

+#ifndef _DIRENT_H
+#define _DIRENT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+
+#define __NEED_ino_t
+#define __NEED_off_t
+#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
+#define __NEED_size_t
+#endif
+
+#include <bits/alltypes.h>
+
+typedef struct __dirstream DIR;
+
+struct dirent
+{
+        ino_t d_ino;
+        off_t d_off;
+        unsigned short d_reclen;
+        unsigned char d_type;
+        char d_name[256];
+};
+
+#define d_fileno d_ino
+
+int            closedir(DIR *);
+DIR           *fdopendir(int);
+DIR           *opendir(const char *);
+struct dirent *readdir(DIR *);
+int            readdir_r(DIR *__restrict, struct dirent *__restrict, struct dirent **__restrict);
+void           rewinddir(DIR *);
+void           seekdir(DIR *, long);
+long           telldir(DIR *);
+int            dirfd(DIR *);
+
+int alphasort(const struct dirent **, const struct dirent **);
+int scandir(const char *, struct dirent ***, int (*)(const struct dirent *), int (*)(const struct dirent **, const struct dirent **));
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define DT_UNKNOWN 0
+#define DT_FIFO 1
+#define DT_CHR 2
+#define DT_DIR 4
+#define DT_BLK 6
+#define DT_REG 8
+#define DT_LNK 10
+#define DT_SOCK 12
+#define DT_WHT 14
+#define IFTODT(x) ((x)>>12 & 017)
+#define DTTOIF(x) ((x)<<12)
+int getdents(int, struct dirent *, size_t);
+#endif
+
+#ifdef _GNU_SOURCE
+int versionsort(const struct dirent **, const struct dirent **);
+#endif
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define dirent64 dirent
+#define readdir64 readdir
+#define readdir64_r readdir_r
+#define scandir64 scandir
+#define alphasort64 alphasort
+#define versionsort64 versionsort
+#define off64_t off_t
+#define ino64_t ino_t
+#define getdents64 getdents
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif