It seems that it isn't possible
to compile php's xslt extension as shared module.

This is bad because until it is possible
distros can't package it separately.

For example right now debian comes with php4-sablot
extension which uses old ext/sablot code.

Since all new development is done with xslt sablot backend
that package is unusable.

In order to make php4-xslt package there must be way to compile it as shared extension.

Configure script seems to understand --enable-xslt=shared
but real linking isn't done.