Install a c++ compiler and the c++ library (g++, libstdc++, libstdc++-dev). This is due to
the ``configure'' script being created with libtool <= 1.5.x, which tests for the
availability of a c++ compiler. This is a known libtool problem, and future versions of modxslt
configure scripts will be created using libtool >= 1.6. Either install a c++ compiler or
recreate the ``configure'' script by yourself (using autoconf).