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Orca requres PHP XSLT extension. Please enable it first then proceed with installation. 

For PHP4, make sure that PHP is compiled with the following extensions:

                    --with-dom --enable-xslt --with-xslt-sablot
                

If these PHP extensions are enabled, then you can see domxml and xslt extensions in phpinfo() with the following options:

                    DOM/XML: enabled
                    XSLT support: enabled
                

For PHP5, make sure that PHP is compiled with the following extension:

                    --with-xsl
                

If this PHP extension is enabled, then you can see xslt extensions in phpinfo() with the following option:

                    XSLT support: enabled