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

fusl/include/time.h

+#ifndef _TIME_H
+#define _TIME_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+
+#ifdef __cplusplus
+#define NULL 0L
+#else
+#define NULL ((void*)0)
+#endif
+
+
+#define __NEED_size_t
+#define __NEED_time_t
+#define __NEED_clock_t
+#define __NEED_struct_timespec
+
+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
+ || defined(_BSD_SOURCE)
+#define __NEED_clockid_t
+#define __NEED_timer_t
+#define __NEED_pid_t
+#define __NEED_locale_t
+#endif
+
+#include <bits/alltypes.h>
+
+#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
+#define __tm_gmtoff tm_gmtoff
+#define __tm_zone tm_zone
+#endif
+
+struct tm
+{
+        int tm_sec;
+        int tm_min;
+        int tm_hour;
+        int tm_mday;
+        int tm_mon;
+        int tm_year;
+        int tm_wday;
+        int tm_yday;
+        int tm_isdst;
+        long __tm_gmtoff;
+        const char *__tm_zone;
+};
+
+clock_t clock (void);
+time_t time (time_t *);
+double difftime (time_t, time_t);
+time_t mktime (struct tm *);
+size_t strftime (char *__restrict, size_t, const char *__restrict, const struct tm *__restrict);
+struct tm *gmtime (const time_t *);
+struct tm *localtime (const time_t *);
+char *asctime (const struct tm *);
+char *ctime (const time_t *);
+int timespec_get(struct timespec *, int);
+
+#define CLOCKS_PER_SEC 1000000L
+
+#define TIME_UTC 1
+
+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
+ || defined(_BSD_SOURCE)
+
+size_t strftime_l (char *  __restrict, size_t, const char *  __restrict, const struct tm *  __restrict, locale_t);
+
+struct tm *gmtime_r (const time_t *__restrict, struct tm *__restrict);
+struct tm *localtime_r (const time_t *__restrict, struct tm *__restrict);
+char *asctime_r (const struct tm *__restrict, char *__restrict);
+char *ctime_r (const time_t *, char *);
+
+void tzset (void);
+
+struct itimerspec
+{
+        struct timespec it_interval;
+        struct timespec it_value;
+};
+
+#define CLOCK_REALTIME           0
+#define CLOCK_MONOTONIC          1
+#define CLOCK_PROCESS_CPUTIME_ID 2
+#define CLOCK_THREAD_CPUTIME_ID  3
+#define CLOCK_MONOTONIC_RAW      4
+#define CLOCK_REALTIME_COARSE    5
+#define CLOCK_MONOTONIC_COARSE   6
+#define CLOCK_BOOTTIME           7
+#define CLOCK_REALTIME_ALARM     8
+#define CLOCK_BOOTTIME_ALARM     9
+#define CLOCK_SGI_CYCLE         10
+#define CLOCK_TAI               11
+
+#define TIMER_ABSTIME 1
+
+int nanosleep (const struct timespec *, struct timespec *);
+int clock_getres (clockid_t, struct timespec *);
+int clock_gettime (clockid_t, struct timespec *);
+int clock_settime (clockid_t, const struct timespec *);
+int clock_nanosleep (clockid_t, int, const struct timespec *, struct timespec *);
+int clock_getcpuclockid (pid_t, clockid_t *);
+
+struct sigevent;
+int timer_create (clockid_t, struct sigevent *__restrict, timer_t *__restrict);
+int timer_delete (timer_t);
+int timer_settime (timer_t, int, const struct itimerspec *__restrict, struct itimerspec *__restrict);
+int timer_gettime (timer_t, struct itimerspec *);
+int timer_getoverrun (timer_t);
+
+#endif
+
+
+#if defined(_XOPEN_SOURCE) || defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
+char *strptime (const char *__restrict, const char *__restrict, struct tm *__restrict);
+extern int daylight;
+extern long timezone;
+extern char *tzname[2];
+extern int getdate_err;
+struct tm *getdate (const char *);
+#endif
+
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+int stime(const time_t *);
+time_t timegm(struct tm *);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif