Issue #2619 has been updated by Hongli Lai. File 0001-Add-method-Process.fork_supported-for-checking-wheth.patch added Oops, I attached the wrong patch: the first one contains some local changes which I did not intend to include. Here's the correct patch. ---------------------------------------- http://redmine.ruby-lang.org/issues/show/2619 ---------------------------------------- http://redmine.ruby-lang.org