diff -ur Libc-1272.200.26/stdlib/FreeBSD/system.c Libc-1272.200.26+iPhone/stdlib/FreeBSD/system.c
--- Libc-1272.200.26/stdlib/FreeBSD/system.c	2018-03-22 07:37:55.000000000 -1000
+++ Libc-1272.200.26+iPhone/stdlib/FreeBSD/system.c	2019-05-01 23:27:20.000000000 -1000
@@ -57,20 +57,14 @@
 #if __DARWIN_UNIX03
 #include <pthread.h>
 
-#if !(TARGET_OS_IPHONE && (TARGET_OS_SIMULATOR || !TARGET_OS_IOS))
 static pthread_mutex_t __systemfn_mutex = PTHREAD_MUTEX_INITIALIZER;
-#endif
 extern int __unix_conforming;
 #endif /* __DARWIN_UNIX03 */
 
 int
-__system(command)
+system(command)
 	const char *command;
 {
-#if TARGET_OS_IPHONE && (TARGET_OS_SIMULATOR || !TARGET_OS_IOS)
-	// Don't abort() on iOS for now
-	LIBC_ABORT("system() is not supported on this platform.");
-#else
 	pid_t pid, savedpid;
 	int pstat, err;
 	struct sigaction ign, intact, quitact;
@@ -88,14 +82,10 @@
 #endif /* __DARWIN_UNIX03 */
 
 	if (!command) {		/* just checking... */
-#if TARGET_OS_IPHONE
-		return(0);
-#else
 		if (access(_PATH_BSHELL, F_OK) == -1)	/* if no sh or no access */
 			return(0);
 		else
 			return(1);
-#endif
 	}
 
 	if ((err = posix_spawnattr_init(&attr)) != 0) {
@@ -114,19 +104,19 @@
 	ign.sa_handler = SIG_IGN;
 	(void)sigemptyset(&ign.sa_mask);
 	ign.sa_flags = 0;
-	(void)_sigaction(SIGINT, &ign, &intact);
+	(void)sigaction(SIGINT, &ign, &intact);
 	if (intact.sa_handler != SIG_IGN) {
 		sigaddset(&defaultsig, SIGINT);
 		flags |= POSIX_SPAWN_SETSIGDEF;
 	}
-	(void)_sigaction(SIGQUIT, &ign, &quitact);
+	(void)sigaction(SIGQUIT, &ign, &quitact);
 	if (quitact.sa_handler != SIG_IGN) {
 		sigaddset(&defaultsig, SIGQUIT);
 		flags |= POSIX_SPAWN_SETSIGDEF;
 	}
 	(void)sigemptyset(&newsigblock);
 	(void)sigaddset(&newsigblock, SIGCHLD);
-	(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
+	(void)sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
 	(void)posix_spawnattr_setsigmask(&attr, &oldsigblock);
 	if (flags & POSIX_SPAWN_SETSIGDEF) {
 		(void)posix_spawnattr_setsigdefault(&attr, &defaultsig);
@@ -138,7 +128,7 @@
 	if (err == 0) {
 		savedpid = pid;
 		do {
-			pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
+			pid = wait4(savedpid, &pstat, 0, (struct rusage *)0);
 		} while (pid == -1 && errno == EINTR);
 		if (pid == -1) pstat = -1;
 	} else if (err == ENOMEM || err == EAGAIN) { /* as if fork failed */
@@ -147,17 +137,14 @@
 		pstat = W_EXITCODE(127, 0); /* couldn't exec shell */
 	}
 
-	(void)_sigaction(SIGINT, &intact, NULL);
-	(void)_sigaction(SIGQUIT,  &quitact, NULL);
-	(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
+	(void)sigaction(SIGINT, &intact, NULL);
+	(void)sigaction(SIGQUIT,  &quitact, NULL);
+	(void)sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
 #if __DARWIN_UNIX03
 	pthread_mutex_unlock(&__systemfn_mutex);
 #endif /* __DARWIN_UNIX03 */
 	return(pstat);
-#endif /* TARGET_OS_IPHONE && (TARGET_OS_SIMULATOR || !TARGET_OS_IOS) */
 }
 
-__weak_reference(__system, system);
-__weak_reference(__system, _system);

 #pragma clang diagnostic pop