Fail to upgrade perl5-5.16 to perl5-5.18

[Mathieu Arnold]

+--On 17 décembre 2014 13:58:50 +0100 Roman Serbski <mefystofel at gmail.com>
wrote:
| Hello,
| 
| FreeBSD 10.1-STABLE (r274583), latest ports (374843).
| 
| I'm trying to upgrade perl5-5.16 to perl5-5.18 using portupgrade.  As
| per /usr/ports/UPDATING, 'portupgrade -o lang/perl5.18 -f
| lang/perl5.16' fails with the following error:
| 
| Writing Makefile for Cwd
| ==> Your Makefile has been rebuilt. <==
| ==> Please rerun the make command.  <==
| false

This usually happens when the host's date is not right, or changing
backwards during the build.

-- 
Mathieu Arnold