Thread:Project:Support desk/Install error Warning: preg replace() function.preg-replace : Compilation failed: this version of PCRE is not compiled with PCRE UTF8 support at offset 0 in /var2/mediawiki-1.16.0/includes/Title.php on line 2285/reply (4)

This is a command-line tool, while we're speaking about the PHP module. Here's a simple check for these capabilities:  

Save it in UTF-8 encoding and run. It should output two dashes without warnings if your PCRE is ok.