Comment 2 for bug 144471

lxml's setup.py (or rather setupinfo.py) currently uses "xslt-config", which should be part of "libxslt1-dev". Could you check what that returns on your system?

I'm on Ubuntu Feisty, and it nicely prints "-I/usr/include/libxml2" for me when asked for the "--cflags".

The problem with pkg-config is that it needs to be installed - and it's *not* currently a standard requirement for building lxml.