PHP 5.0.1 Compilation Error

Hi Newsgroup, while compiling PHP 5.0.1 on an Linux system, the following error occur: ext/soap/php_encoding.lo(.text+0x594): In function `to_zval_string': /usr/local/src/php-5.0.1/ext/soap/php_encoding.c:467: undefined reference to `xmlBufferCreateStatic' ext/soap/php_encoding.lo(.text+0x76a): In function `to_zval_stringr': /usr/local/src/php-5.0.1/ext/soap/php_encoding.c:503: undefined reference to `xmlBufferCreateStatic' ext/soap/php_encoding.lo(.text+0x95a): In function `to_zval_stringc': /usr/local/src/php-5.0.1/ext/soap/php_encoding.c:539: undefined reference to `xmlBufferCreateStatic' ext/soap/php_encoding.lo(.text+0xc3e): In function `to_xml_string': /usr/local/src/php-5.0.1/ext/soap/php_encoding.c:607: undefined reference to `xmlBufferCreateStatic' collect2: ld returned 1 exit status make: *** [sapi/cli/php] Error 1 I used the same configure options for PHP 5.0.0 without errors. Any idea ? Thanks Stefan