set postParseLinkColour to false to force "real" link. There must be a better way to do this.
$nnt = Title::newFromText ( Namespace::getCanonicalName($category).":".$t ) ;
$wgLinkCache->suspend(); # Don't save in links/brokenlinks
+ $pPLC=$sk->postParseLinkColour();
+ $sk->postParseLinkColour( false );
$t = $sk->makeLinkObj( $nnt, $t, '', '' , $prefix );
+ $sk->postParseLinkColour( $pPLC );
$wgLinkCache->resume();
$sortkey = $wasblank ? $this->mTitle->getPrefixedText() : $text;