Re: a bad use of strerror_r

[Paul Eggert]

This patch looks good to me. I'll CC: this to Sergey as he's our argp 
expert; if he doesn't respond in a few days, please install into gnulib. 
Sergey, the patch is here:

http://lists.gnu.org/archive/html/bug-gnulib/2016-10/msg00069.html