diff --git a/Zend/Zend.m4 b/Zend/Zend.m4
index eb41cdc09e3..8b7971eea1d 100644
--- a/Zend/Zend.m4
+++ b/Zend/Zend.m4
@@ -260,106 +260,6 @@ int main()
 
 AC_MSG_RESULT(done)
 
-dnl test for memory allocation using mmap(MAP_ANON)
-AC_MSG_CHECKING(for memory allocation using mmap(MAP_ANON))
-
-AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <stdlib.h>
-#include <stdio.h>
-#ifndef MAP_ANON
-# ifdef MAP_ANONYMOUS
-#  define MAP_ANON MAP_ANONYMOUS
-# endif
-#endif
-#ifndef MREMAP_MAYMOVE
-# define MREMAP_MAYMOVE 0
-#endif
-#ifndef MAP_FAILED
-# define MAP_FAILED ((void*)-1)
-#endif
-
-#define SEG_SIZE (256*1024)
-
-int main()
-{
-	void *seg = mmap(NULL, SEG_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
-	if (seg == MAP_FAILED) {
-		return 1;
-	}
-	if (munmap(seg, SEG_SIZE) != 0) {
-		return 2;
-	}
-	return 0;
-}
-]])], [
-  AC_DEFINE([HAVE_MEM_MMAP_ANON], 1, [Define if the target system has support for memory allocation using mmap(MAP_ANON)])
-  AC_MSG_RESULT(yes)
-], [
-  AC_MSG_RESULT(no)
-], [
-  dnl cross-compile needs something here
-  AC_MSG_RESULT(no)
-])
-
-dnl test for memory allocation using mmap("/dev/zero")
-AC_MSG_CHECKING(for memory allocation using mmap("/dev/zero"))
-
-AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <stdlib.h>
-#include <stdio.h>
-#ifndef MAP_ANON
-# ifdef MAP_ANONYMOUS
-#  define MAP_ANON MAP_ANONYMOUS
-# endif
-#endif
-#ifndef MREMAP_MAYMOVE
-# define MREMAP_MAYMOVE 0
-#endif
-#ifndef MAP_FAILED
-# define MAP_FAILED ((void*)-1)
-#endif
-
-#define SEG_SIZE (256*1024)
-
-int main()
-{
-	int fd;
-	void *seg;
-
-	fd = open("/dev/zero", O_RDWR, S_IRUSR | S_IWUSR);
-	if (fd < 0) {
-		return 1;
-	}
-	seg = mmap(NULL, SEG_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-	if (seg == MAP_FAILED) {
-		return 2;
-	}
-	if (munmap(seg, SEG_SIZE) != 0) {
-		return 3;
-	}
-	if (close(fd) != 0) {
-		return 4;
-	}
-	return 0;
-}
-]])], [
-  AC_DEFINE([HAVE_MEM_MMAP_ZERO], 1, [Define if the target system has support for memory allocation using mmap("/dev/zero")])
-  AC_MSG_RESULT(yes)
-], [
-  AC_MSG_RESULT(no)
-], [
-  dnl cross-compile needs something here
-  AC_MSG_RESULT(no)
-])
-
 AC_CHECK_FUNCS(mremap)