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I cannot install lxml. In system i have python-lxml package, but i need other... Please help, if you can - my task is install lxml for development in virtual enviroment using virtualenv. I found this solution repaired successfully installation lxml:

$ sudo apt-get install libxml2 libxml2-dev libxslt-dev build-essential python-dev
$ sudo ldconfig

Then:

$ source bin/activate # for activate enviroment
(env) $ pip install lxml

But i have many problems.

First problem was install build-essential with dependencies - why build-essential failed?

It solved! Thanks for it!

Next i have this one (output):

(env) $ pip install lxml

...

i686-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-i686-2.7/src/lxml/lxml.etree.o -lxslt -lexslt -lxml2 -lz -lm -o build/lib.linux-i686-2.7/lxml/etree.so

/usr/bin/ld: cannot find -lz

collect2: error: ld returned 1 exit status

error: command 'i686-linux-gnu-gcc' failed with exit status 1

----------------------------------------
Cleaning up...
Command /tmp/1/bin/python -c "import setuptools, tokenize;__file__='/tmp/1/build/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-DpYhbY-record/install-record.txt --single-version-externally-managed --compile --install-headers /tmp/1/include/site/python2.7 failed with error code 1 in /tmp/1/build/lxml
Storing debug log for failure in /home/constantia/.pip/pip.log

I read this instruction http://lxml.de/installation.html and try:

STATIC_DEPS=true pip install lxml

I try:

(env) $ STATIC_DEPS=true pip install lxml

...


  File "buildlibxml.py", line 268, in call_subprocess

    raise Exception('Command "%s" returned code %s' % (cmd_desc, returncode))

Exception: Command "make -j3" returned code 512

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /tmp/1/build/lxml
Traceback (most recent call last):
  File "/tmp/1/bin/pip", line 11, in <module>
    sys.exit(main())
  File "/tmp/1/local/lib/python2.7/site-packages/pip/__init__.py", line 185, in main
    return command.main(cmd_args)
  File "/tmp/1/local/lib/python2.7/site-packages/pip/basecommand.py", line 161, in main
    text = '\n'.join(complete_log)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 13: ordinal not in range(128)

I understand that reason may be LANG variables and try this:

$ unset LANG

I have after (output):

(env) $ STATIC_DEPS=true pip install lxml

...

  File "buildlibxml.py", line 268, in call_subprocess

    raise Exception('Command "%s" returned code %s' % (cmd_desc, returncode))

Exception: Command "make -j3" returned code 512

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /tmp/1/build/lxml
Storing debug log for failure in /home/constantia/.pip/pip.log

So, i try to use easy_install with STATIC_DEPS=true

I have after (output):

(env) $ STATIC_DEPS=true pip install lxml

...

make[2]: *** [progname.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/tmp/easy_install-bqh5aG/lxml-3.3.5/build/tmp/libiconv-1.14/srclib'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/tmp/easy_install-bqh5aG/lxml-3.3.5/build/tmp/libiconv-1.14/srclib'
make: *** [all] Error 2
Traceback (most recent call last):
  File "/tmp/1/bin/easy_install", line 11, in <module>
    sys.exit(main())
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1909, in main
    with_ei_usage(lambda:
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1896, in with_ei_usage
    return f()
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1913, in <lambda>
    distclass=DistributionWithoutHelpCommands, **kw
  File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 358, in run
    self.easy_install(spec, not self.no_deps)
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 593, in easy_install
    return self.install_item(spec, dist.location, tmpdir, deps)
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 623, in install_item
    dists = self.install_eggs(spec, download, tmpdir)
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 809, in install_eggs
    return self.build_and_install(setup_script, setup_base)
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1015, in build_and_install
    self.run_setup(setup_script, setup_base, args)
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1000, in run_setup
    run_setup(setup_script, args)
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/sandbox.py", line 50, in run_setup
    lambda: execfile(
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/sandbox.py", line 100, in run
    return func()
  File "/tmp/1/local/lib/python2.7/site-packages/setuptools/sandbox.py", line 52, in <lambda>
    {'__file__':setup_script, '__name__':'__main__'}
  File "setup.py", line 229, in <module>
  File "setup.py", line 140, in setup_extra_options
  File "/tmp/easy_install-bqh5aG/lxml-3.3.5/setupinfo.py", line 57, in ext_modules
  File "/tmp/easy_install-bqh5aG/lxml-3.3.5/buildlibxml.py", line 348, in build_libxml2xslt
  File "/tmp/easy_install-bqh5aG/lxml-3.3.5/buildlibxml.py", line 285, in cmmi
  File "/tmp/easy_install-bqh5aG/lxml-3.3.5/buildlibxml.py", line 268, in call_subprocess
Exception: Command "make -j3" returned code 512

So i sad and don't know what to do. I believe for help from Stack Exchange community.

Sorry for my question and English (it's not my native language).

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1 Answer 1

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9

The -lz means a library file named libz.so. This file is provided by the zlib1g-dev package. Run sudo apt-get install zlib1g-dev to install the package, and try your original command again (without STATIC_DEPS).

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  • 1
    Thank you very much! pip install lxml, after sudo apt-get install zlib1g-dev solve my problem at all. How do you determine that this command solve the problem? Is it your own experience or i could find something about it... i mean -lz. I am trying not to make stupid questions in future...
    – dmgl
    Jun 25, 2014 at 20:29
  • The -l flag refers to a library, and the name after -l is the name of the library (without the lib prefix), so -lsomething refers to a library file named libsomething.so. In this case, the library is libz.so. Usually, you know what the library is and can just do apt-get install something-dev or the appropriate package name, but this is one of those exceptions. apt-file helped identify the package.
    – saiarcot895
    Jun 25, 2014 at 20:38
  • 1
    Than you very-very much!
    – dmgl
    Jun 27, 2014 at 20:06

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