title: Installing lxml with pip in virtualenv Ubuntu 12.10 error: command 'gcc' failed with exit status 4
body: <p>I'm having the following error when trying to run "pip install lxml" into a virtualenv in Ubuntu 12.10 x64. I have Python 2.7.</p>
  
  <p>I have seen other related questions here about the same problem and tried installing python-dev, libxml2-dev and libxslt1-dev.</p>
  
  <p>Please take a look of the traceback from the moment I tip the command to the moment when the error occurs.</p>
  
  <pre>
  Downloading/unpacking lxml
    Running setup.py egg_info for package lxml
      /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'bugtrack_url'
        warnings.warn(msg)
      Building lxml version 3.1.2.
      Building without Cython.
      Using build configuration of libxslt 1.1.26
      Building against libxml2/libxslt in the following directory: /usr/lib
  
      warning: no files found matching '*.txt' under directory 'src/lxml/tests'
  Installing collected packages: lxml
    Running setup.py install for lxml
      /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'bugtrack_url'
        warnings.warn(msg)
      Building lxml version 3.1.2.
      Building without Cython.
      Using build configuration of libxslt 1.1.26
      Building against libxml2/libxslt in the following directory: /usr/lib
      building 'lxml.etree' extension
      gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/libxml2 -I/home/admin/.virtualenvs/dev.actualito.com/build/lxml/src/lxml/includes -I/usr/include/python2.7 -c src/lxml/lxml.etree.c -o build/temp.linux-x86_64-2.7/src/lxml/lxml.etree.o
      src/lxml/lxml.etree.c: In function '__pyx_f_4lxml_5etree__getFilenameForFile':
      src/lxml/lxml.etree.c:26851:7: warning: variable '__pyx_clineno' set but not used [-Wunused-but-set-variable]
      src/lxml/lxml.etree.c:26850:15: warning: variable '__pyx_filename' set but not used [-Wunused-but-set-variable]
      src/lxml/lxml.etree.c:26849:7: warning: variable '__pyx_lineno' set but not used [-Wunused-but-set-variable]
      src/lxml/lxml.etree.c: In function '__pyx_pf_4lxml_5etree_4XSLT_18__call__':
      src/lxml/lxml.etree.c:138273:81: warning: passing argument 1 of '__pyx_f_4lxml_5etree_12_XSLTContext__copy' from incompatible pointer type [enabled by default]
      src/lxml/lxml.etree.c:136229:52: note: expected 'struct __pyx_obj_4lxml_5etree__XSLTContext *' but argument is of type 'struct __pyx_obj_4lxml_5etree__BaseContext *'
      src/lxml/lxml.etree.c: In function '__pyx_f_4lxml_5etree__copyXSLT':
      src/lxml/lxml.etree.c:139667:79: warning: passing argument 1 of '__pyx_f_4lxml_5etree_12_XSLTContext__copy' from incompatible pointer type [enabled by default]
      src/lxml/lxml.etree.c:136229:52: note: expected 'struct __pyx_obj_4lxml_5etree__XSLTContext *' but argument is of type 'struct __pyx_obj_4lxml_5etree__BaseContext *'
      src/lxml/lxml.etree.c: At top level:
      src/lxml/lxml.etree.c:12384:13: warning: '__pyx_f_4lxml_5etree_displayNode' defined but not used [-Wunused-function]
      gcc: internal compiler error: Killed (program cc1)
      Please submit a full bug report,
      with preprocessed source if appropriate.
      See  for instructions.
      error: command 'gcc' failed with exit status 4
      Complete output from command /home/admin/.virtualenvs/dev.actualito.com/bin/python -c "import setuptools;__file__='/home/admin/.virtualenvs/dev.actualito.com/build/lxml/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-asDtN5-record/install-record.txt --single-version-externally-managed --install-headers /home/admin/.virtualenvs/dev.actualito.com/include/site/python2.7:
      /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'bugtrack_url'
  
    warnings.warn(msg)
  
  Building lxml version 3.1.2.
  
  Building without Cython.
  
  Using build configuration of libxslt 1.1.26
  
  Building against libxml2/libxslt in the following directory: /usr/lib
  
  running install
  
  running build
  
  running build_py
  
  copying src/lxml/includes/lxml-version.h -> build/lib.linux-x86_64-2.7/lxml/includes
  
  running build_ext
  
  building 'lxml.etree' extension
  
  gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/libxml2 -I/home/admin/.virtualenvs/dev.actualito.com/build/lxml/src/lxml/includes -I/usr/include/python2.7 -c src/lxml/lxml.etree.c -o build/temp.linux-x86_64-2.7/src/lxml/lxml.etree.o
  
  src/lxml/lxml.etree.c: In function '__pyx_f_4lxml_5etree__getFilenameForFile':
  
  src/lxml/lxml.etree.c:26851:7: warning: variable '__pyx_clineno' set but not used [-Wunused-but-set-variable]
  
  src/lxml/lxml.etree.c:26850:15: warning: variable '__pyx_filename' set but not used [-Wunused-but-set-variable]
  
  src/lxml/lxml.etree.c:26849:7: warning: variable '__pyx_lineno' set but not used [-Wunused-but-set-variable]
  
  src/lxml/lxml.etree.c: In function '__pyx_pf_4lxml_5etree_4XSLT_18__call__':
  
  src/lxml/lxml.etree.c:138273:81: warning: passing argument 1 of '__pyx_f_4lxml_5etree_12_XSLTContext__copy' from incompatible pointer type [enabled by default]
  
  src/lxml/lxml.etree.c:136229:52: note: expected 'struct __pyx_obj_4lxml_5etree__XSLTContext *' but argument is of type 'struct __pyx_obj_4lxml_5etree__BaseContext *'
  
  src/lxml/lxml.etree.c: In function '__pyx_f_4lxml_5etree__copyXSLT':
  
  src/lxml/lxml.etree.c:139667:79: warning: passing argument 1 of '__pyx_f_4lxml_5etree_12_XSLTContext__copy' from incompatible pointer type [enabled by default]
  
  src/lxml/lxml.etree.c:136229:52: note: expected 'struct __pyx_obj_4lxml_5etree__XSLTContext *' but argument is of type 'struct __pyx_obj_4lxml_5etree__BaseContext *'
  
  src/lxml/lxml.etree.c: At top level:
  
  src/lxml/lxml.etree.c:12384:13: warning: '__pyx_f_4lxml_5etree_displayNode' defined but not used [-Wunused-function]
  
  gcc: internal compiler error: Killed (program cc1)
  
  Please submit a full bug report,
  
  with preprocessed source if appropriate.
  
  See  for instructions.
  
  error: command 'gcc' failed with exit status 4
  
  ----------------------------------------
  Command /home/admin/.virtualenvs/dev.actualito.com/bin/python -c "import setuptools;__file__='/home/admin/.virtualenvs/dev.actualito.com/build/lxml/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-asDtN5-record/install-record.txt --single-version-externally-managed --install-headers /home/admin/.virtualenvs/dev.actualito.com/include/site/python2.7 failed with error code 1 in /home/admin/.virtualenvs/dev.actualito.com/build/lxml
  Storing complete log in /home/admin/.pip/pip.log
  </pre>