diff --git a/boost/libs/filesystem/src/operations.cpp b/boost/libs/filesystem/src/operations.cpp
index c9331f9..a5f0c79 100644
--- a/boost/libs/filesystem/src/operations.cpp
+++ b/boost/libs/filesystem/src/operations.cpp
@@ -1400,7 +1400,7 @@ namespace detail
     else if (prms & remove_perms)
       prms = current_status.permissions() & ~prms;
 
-    // Mac OS X Lion and some other platforms don't support fchmodat().
+    // OS X <10.10, iOS <8.0 and some other platforms don't support fchmodat().
     // Solaris (SunPro and gcc) only support fchmodat() on Solaris 11 and higher,
     // and a runtime check is too much trouble.
     // Linux does not support permissions on symbolic links and has no plans to
@@ -1413,7 +1413,11 @@ namespace detail
     //   "http://man7.org/linux/man-pages/man2/fchmodat.2.html"
 #   if defined(AT_FDCWD) && defined(AT_SYMLINK_NOFOLLOW) \
       && !(defined(__SUNPRO_CC) || defined(__sun) || defined(sun)) \
-      && !(defined(linux) || defined(__linux) || defined(__linux__))
+      && !(defined(linux) || defined(__linux) || defined(__linux__)) \
+      && !(defined(__MAC_OS_X_VERSION_MIN_REQUIRED) \
+           && __MAC_OS_X_VERSION_MIN_REQUIRED < 101000) \
+      && !(defined(__IPHONE_OS_VERSION_MIN_REQUIRED) \
+           && __IPHONE_OS_VERSION_MIN_REQUIRED < 80000)
       if (::fchmodat(AT_FDCWD, p.c_str(), mode_cast(prms),
            !(prms & symlink_perms) ? 0 : AT_SYMLINK_NOFOLLOW))
 #   else  // fallback if fchmodat() not supported