Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -891,21 +891,30 @@
 	*-*-msdosdjgpp*)
 		have_processes="no"
 		;;
 	*)
 		AC_CHECK_FUNCS([fork dup2 execvp kill _exit], [
-			if test x"$ac_cv_func_fork" = x"yes" \
+			AS_IF([test x"$ac_cv_func_fork" = x"yes" \
 			    -a x"$ac_cv_func_pipe" = x"yes" \
 			    -a x"$ac_cv_func_dup2" = x"yes" \
 			    -a x"$ac_cv_func_execvp" = x"yes" \
 			    -a x"$ac_cv_func_kill" = x"yes" \
-			    -a x"$ac_cv_func__exit" = x"yes"; then
+			    -a x"$ac_cv_func__exit" = x"yes"], [
 				have_processes="yes"
-			fi
+			])
 		], [
 			break
 		])
+
+		AC_CHECK_FUNCS(posix_spawnp)
+
+		AS_IF([test x"$ac_cv_func_posix_spawnp" = x"yes" \
+		    -a x"$ac_cv_func_kill" = x"yes"], [
+			have_processes="yes"
+
+			AC_CHECK_HEADERS(spawn.h)
+		])
 		;;
 esac
 AS_IF([test x"$have_processes" = x"yes"], [
 	AC_SUBST(OFPROCESS_M, "OFProcess.m")
 	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])

Index: src/OFProcess.m
==================================================================
--- src/OFProcess.m
+++ src/OFProcess.m
@@ -27,12 +27,12 @@
 # include <unistd.h>
 # include <signal.h>
 # include <sys/wait.h>
 #endif
 
-#ifdef __MACH__
-# include <crt_externs.h>
+#ifdef HAVE_SPAWN_H
+# include <spawn.h>
 #endif
 
 #import "OFProcess.h"
 #import "OFString.h"
 #import "OFArray.h"
@@ -53,12 +53,11 @@
 extern char **environ;
 #endif
 
 @interface OFProcess (OF_PRIVATE_CATEGORY)
 #ifndef _WIN32
-- (void)OF_getArgC: (int*)argc
-	   andArgV: (char***)argv
+- (void)OF_getArgV: (char***)argv
     forProgramName: (OFString*)programName
       andArguments: (OFArray*)arguments;
 - (char**)OF_environmentForDictionary: (OFDictionary*)dictionary;
 #else
 - (of_char16_t*)OF_environmentForDictionary: (OFDictionary*)dictionary;
@@ -139,48 +138,89 @@
 
 	@try {
 #ifndef _WIN32
 		void *pool = objc_autoreleasePoolPush();
 		const char *path;
-		int argc;
-		char **argv, **env;
+		char **argv;
 
 		if (pipe(_readPipe) != 0 || pipe(_writePipe) != 0)
 			@throw [OFInitializationFailedException
 			    exceptionWithClass: [self class]];
 
 		path = [program cStringWithEncoding:
 		    [OFSystemInfo native8BitEncoding]];
-		[self OF_getArgC: &argc
-			 andArgV: &argv
+		[self OF_getArgV: &argv
 		  forProgramName: programName
 		    andArguments: arguments];
-		env = [self OF_environmentForDictionary: environment];
-
-		if ((_pid = fork()) == 0) {
-#ifdef __MACH__
-			*_NSGetEnviron() = env;
-#else
-			environ = env;
-#endif
-
-			close(_readPipe[0]);
-			close(_writePipe[1]);
-			dup2(_writePipe[0], 0);
-			dup2(_readPipe[1], 1);
-			execvp(path, argv);
-
-			_exit(EXIT_FAILURE);
-		}
-
-		close(_readPipe[1]);
-		close(_writePipe[0]);
-		[self freeMemory: argv];
-
-		if (_pid == -1)
-			@throw [OFInitializationFailedException
-			    exceptionWithClass: [self class]];
+
+		@try {
+			char **env = [self
+			    OF_environmentForDictionary: environment];
+# ifdef HAVE_POSIX_SPAWNP
+			posix_spawn_file_actions_t actions;
+			posix_spawnattr_t attr;
+
+			if (posix_spawn_file_actions_init(&actions) != 0)
+				@throw [OFInitializationFailedException
+				    exceptionWithClass: [self class]];
+
+			if (posix_spawnattr_init(&attr) != 0) {
+				posix_spawn_file_actions_destroy(&actions);
+
+				@throw [OFInitializationFailedException
+				    exceptionWithClass: [self class]];
+			}
+
+			@try {
+				if (posix_spawn_file_actions_addclose(&actions,
+				    _readPipe[0]) != 0 ||
+				    posix_spawn_file_actions_addclose(&actions,
+				    _writePipe[1]) != 0 ||
+				    posix_spawn_file_actions_adddup2(&actions,
+				    _writePipe[0], 0) != 0 ||
+				    posix_spawn_file_actions_adddup2(&actions,
+				    _readPipe[1], 1) != 0)
+					@throw [OFInitializationFailedException
+					    exceptionWithClass: [self class]];
+
+#  ifdef POSIX_SPAWN_CLOEXEC_DEFAULT
+				if (posix_spawnattr_setflags(&attr,
+				    POSIX_SPAWN_CLOEXEC_DEFAULT) != 0)
+					@throw [OFInitializationFailedException
+					    exceptionWithClass: [self class]];
+#  endif
+
+				if (posix_spawnp(&_pid, path, &actions, &attr,
+				    argv, env) != 0)
+					@throw [OFInitializationFailedException
+					    exceptionWithClass: [self class]];
+			} @finally {
+				posix_spawn_file_actions_destroy(&actions);
+				posix_spawnattr_destroy(&attr);
+			}
+# else
+			if ((_pid = fork()) == 0) {
+				environ = env;
+
+				close(_readPipe[0]);
+				close(_writePipe[1]);
+				dup2(_writePipe[0], 0);
+				dup2(_readPipe[1], 1);
+				execvp(path, argv);
+
+				_exit(EXIT_FAILURE);
+			}
+
+			if (_pid == -1)
+				@throw [OFInitializationFailedException
+				    exceptionWithClass: [self class]];
+# endif
+		} @finally {
+			close(_readPipe[1]);
+			close(_writePipe[0]);
+			[self freeMemory: argv];
+		}
 
 		objc_autoreleasePoolPop(pool);
 #else
 		SECURITY_ATTRIBUTES sa;
 		PROCESS_INFORMATION pi;
@@ -297,12 +337,11 @@
 
 	[super dealloc];
 }
 
 #ifndef _WIN32
-- (void)OF_getArgC: (int*)argc
-	   andArgV: (char***)argv
+- (void)OF_getArgV: (char***)argv
     forProgramName: (OFString*)programName
       andArguments: (OFArray*)arguments
 {
 	OFString *const *objects = [arguments objects];
 	size_t i, count = [arguments count];