This is my error: (mysite)zjm1126@zjm1126-G41MT-S2:~/zjm_test/mysite$ pip install lxml Downloading/unpacking lxml Running setup.py egg_info for package lxml Building lxml version 2.3. Building without Cython. ERROR: /bin/sh: xslt-config: not found ** make sure the development packages of libxml2 and libxslt are installed ** Using build configuration of libxslt Installing collected packages: lxml R