It looks more like a problem with your libxml2 build. Could you try if you can build libxml2 2.9.0 separately on your system?
This error hints at an issue outside of lxml:
"""
Making all in devhelp
make[3]: ingresso nella directory "/home/alex/.virtualenvs/SPSE/build/lxml/build/tmp/libxml2-2.9.0/doc/devhelp"
make[3]: *** Nessuna regola per generare l'obiettivo "home.png", necessario per "all-am". Arresto.
"""
BTW, when you post error output in an english speaking place, please make sure your clear the "LANG" environment variable before running the build, e.g. "LANG= python setup.py build".
It looks more like a problem with your libxml2 build. Could you try if you can build libxml2 2.9.0 separately on your system?
This error hints at an issue outside of lxml:
""" alex/.virtualen vs/SPSE/ build/lxml/ build/tmp/ libxml2- 2.9.0/doc/ devhelp"
Making all in devhelp
make[3]: ingresso nella directory "/home/
make[3]: *** Nessuna regola per generare l'obiettivo "home.png", necessario per "all-am". Arresto.
"""
BTW, when you post error output in an english speaking place, please make sure your clear the "LANG" environment variable before running the build, e.g. "LANG= python setup.py build".