error solved

mayank@mayank-Inspiron-N5110:~/soc$ venv/bin/pip install -U lxml setuptools
Downloading/unpacking lxml
  Downloading lxml-3.3.0.tar.gz (3.4MB): 3.4MB downloaded
  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 3.3.0.
    Building without Cython.
    Using build configuration of libxslt 1.1.28

    warning: no previously-included files found matching '*.py'
Downloading/unpacking setuptools from https://pypi.python.org/packages/source/s/setuptools/setuptools-2.2.tar.gz#md5=04a7664538957b832710653fd7d5b4e6
  Downloading setuptools-2.2.tar.gz (786kB): 786kB downloaded
  Running setup.py egg_info for package setuptools

Installing collected packages: lxml, setuptools
  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 3.3.0.
    Building without Cython.
    Using build configuration of libxslt 1.1.28
    building 'lxml.etree' extension
    x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/libxml2 -I/home/mayank/soc/venv/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 -w
    x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -D_FORTIFY_SOURCE=2 -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security build/temp.linux-x86_64-2.7/src/lxml/lxml.etree.o -lxslt -lexslt -lxml2 -lz -lm -o build/lib.linux-x86_64-2.7/lxml/etree.so
    building 'lxml.objectify' extension
    x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/libxml2 -I/home/mayank/soc/venv/build/lxml/src/lxml/includes -I/usr/include/python2.7 -c src/lxml/lxml.objectify.c -o build/temp.linux-x86_64-2.7/src/lxml/lxml.objectify.o -w
    x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -D_FORTIFY_SOURCE=2 -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security build/temp.linux-x86_64-2.7/src/lxml/lxml.objectify.o -lxslt -lexslt -lxml2 -lz -lm -o build/lib.linux-x86_64-2.7/lxml/objectify.so

  Found existing installation: setuptools 0.9.8
    Uninstalling setuptools:
      Successfully uninstalled setuptools
  Running setup.py install for setuptools

    Installing easy_install script to /home/mayank/soc/venv/bin
    Installing easy_install-2.7 script to /home/mayank/soc/venv/bin
Successfully installed lxml setuptools
Cleaning up...