The `strcasestr(3)` function is non-standard, so we must add the [appropriate Gnulib module][1] (as I [mentioned][2] in #1233). I can do that for the 2.2 release, just didn't get to that yet.
[1]: https://www.gnu.org/software/gnulib/manual/html_node/strcasestr.html [2]: https://github.com/monitoring-plugins/monitoring-plugins/issues/1233#issuecomment-34872523 -- Reply to this email on GitHub: https://github.com/monitoring-plugins/monitoring-plugins/pull/1386#issuecomment-148327779
