The problem occurs when running 1.3.9rc1 on a PHP version older than 4.3.0. In lib-common.php, around line 198, you have
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$curPHPIncludePath = ini_get( 'include_path' );
if( ini_set( 'include_path', $_CONF['path_pear'] . PATH_SEPARATOR
. $curPHPIncludePath ) === false )
The problem is that PATH_SEPARATOR exists only as of PHP 4.3.0. Replace it with ':' (if your on a Unix system - ';' for Windows):
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$curPHPIncludePath = ini_get( 'include_path' );
if( ini_set( 'include_path', $_CONF['path_pear'] . ':'
. $curPHPIncludePath ) === false )
bye, Dirk