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PHP dies with a fatal error when trying to use a skin.

This fixed it for me:

$ diff -c phase3/includes/SkinTemplate.php mediawiki-1.17/includes/
*** phase3/includes/SkinTemplate.php 2010-11-11 00:10:10.000000000 +0000
--- mediawiki-1.17/includes/SkinTemplate.php  2010-11-13 09:06:30.000000000 +0000
***************
*** 217,223 ****
       $tpl->setRef( 'xhtmldefaultnamespace', $wgXhtmlDefaultNamespace );
       $tpl->set( 'xhtmlnamespaces', $wgXhtmlNamespaces );
       $tpl->set( 'html5version', $wgHtml5Version );
!      $tpl->set( 'headlinks', $out->getHeadLinks( $this->getSkinName() ) );
       $tpl->set( 'csslinks', $out->buildCssLinks() );

       if( $wgUseTrackbacks && $out->isArticleRelated() ) {
--- 217,223 ----
       $tpl->setRef( 'xhtmldefaultnamespace', $wgXhtmlDefaultNamespace );
       $tpl->set( 'xhtmlnamespaces', $wgXhtmlNamespaces );
       $tpl->set( 'html5version', $wgHtml5Version );
!      $tpl->set( 'headlinks', $out->getHeadLinks( $this ) );
       $tpl->set( 'csslinks', $out->buildCssLinks() );

       if( $wgUseTrackbacks && $out->isArticleRelated() ) {