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

fusl/src/ipc/semget.c

+#include <sys/sem.h>
+#include <limits.h>
+#include <errno.h>
+#include "syscall.h"
+#include "ipc.h"
+
+int semget(key_t key, int n, int fl)
+{
+        /* The kernel uses the wrong type for the sem_nsems member
+         * of struct semid_ds, and thus might not check that the
+         * n fits in the correct (per POSIX) userspace type, so
+         * we have to check here. */
+        if (n > USHRT_MAX) return __syscall_ret(-EINVAL);
+#ifdef SYS_semget
+        return syscall(SYS_semget, key, n, fl);
+#else
+        return syscall(SYS_ipc, IPCOP_semget, key, n, fl);
+#endif
+}