I was trying to install the Sablotron extension, but found running ./configure --with-sablot=DIR will error as it won't be able to link all the XML functions.
The reason for this is the line in the script saying:

LIBS=" -lsablot $LIBS"

This should be replaced with:

LIBS="-lxmltok -lxmlparse -lsablot $LIBS"

which will link in all the appropriate xml libraries allowing Sablotron to link completely.

Joe Pietroni.