Thread:Project:Support desk/MediaWiki v1.19.1 installation: Compilation failed: support for \P, \p, and \X has not been compiled/reply

AFAIK the only things that can be done are to (1) recompile PHP using, (2) check to see if another version of PHP is available, or (3) report the bug to the distribution maintainers. The source code can be found here.