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

fusl/include/sys/shm.h

+#ifndef _SYS_SHM_H
+#define _SYS_SHM_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+
+#define __NEED_time_t
+#define __NEED_size_t
+#define __NEED_pid_t
+
+#include <bits/alltypes.h>
+
+#include <sys/ipc.h>
+
+#ifdef _GNU_SOURCE
+#define __used_ids used_ids
+#define __swap_attempts swap_attempts
+#define __swap_successes swap_successes
+#endif
+
+#include <bits/shm.h>
+
+#define SHM_R 0400
+#define SHM_W 0200
+
+#define SHM_RDONLY 010000
+#define SHM_RND    020000
+#define SHM_REMAP  040000
+#define SHM_EXEC   0100000
+
+#define SHM_LOCK 11
+#define SHM_UNLOCK 12
+#define SHM_STAT 13
+#define SHM_INFO 14
+#define SHM_DEST 01000
+#define SHM_LOCKED 02000
+#define SHM_HUGETLB 04000
+#define SHM_NORESERVE 010000
+
+typedef unsigned long shmatt_t;
+
+void *shmat(int, const void *, int);
+int shmctl(int, int, struct shmid_ds *);
+int shmdt(const void *);
+int shmget(key_t, size_t, int);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif