title: Cannot install lxml 3.3.3 on OSX 10.9 with buildout
body: <p>Have seen numerous related posts but not had any luck getting this to work. Log shows:</p>
  
  <pre><code>We have no distributions for lxml that satisfies 'lxml'.
  Getting distribution for 'lxml'.
  Running easy_install:
  "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python" "-c" "from setuptools.command.easy_install import main; main()" "-mZUNxd" "/Users/brad/Development/python/eggs/tmpLpoVC3" "-q" "/var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/tmpZx0t7aget_dist/lxml-3.3.3.tar.gz"
  path=/Users/brad/Development/python/eggs/setuptools-0.7.2-py2.7.egg
  
  /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'bugtrack_url'
    warnings.warn(msg)
  In file included from src/lxml/lxml.etree.c:346:
  /var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/easy_install-XSC3pm/lxml-3.3.3/src/lxml/includes/etree_defs.h:9:10: fatal error: 'libxml/xmlversion.h' file not found
  #include "libxml/xmlversion.h"
           ^
  1 error generated.
  error: Setup script exited with error: command '/usr/bin/clang' failed with exit status 1Building lxml version 3.3.3.
  Building without Cython.
  ERROR: /bin/sh: xslt-config: command not found
  
  ** make sure the development packages of libxml2 and libxslt are installed **
  
  Using build configuration of libxslt 
  
  An error occurred when trying to install lxml 3.3.3. Look above this message for any errors that were output by easy_install.
  While:
    Installing pydev.
    Getting distribution for 'lxml'.
  Error: Couldn't install: lxml 3.3.3
  </code></pre>
  
  <p><strong>Tried answers from <a href="https://stackoverflow.com/questions/19548011/cannot-install-lxml-on-mac-os-x-10-9">Cannot install Lxml on Mac os x 10.9</a>.</strong></p>
  
  <p><code>xcode-select --install</code> worked initially until an XCode upgrade to 10.5. Then hasn't worked since (even after retrying this line). Now I always get <code>Can't install the software because it is not currently available from the Software Update server</code></p>
  
  <p>Tried this <code>STATIC_DEPS=true pip install lxml</code>. It installed with error:</p>
  
  <pre><code>clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
  
  clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
  
  error: command 'cc' failed with exit status 1
  
  ----------------------------------------
  Cleaning up...
  Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip_build_brad/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip-4lSNM3-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip_build_brad/lxml
  Storing debug log for failure in /Users/brad/Library/Logs/pip.log
  </code></pre>
  
  <p><strong>That log file ends with:</strong></p>
  
  <pre><code>Cleaning up...
    Removing temporary dir /private/var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip_build_brad...
  Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip_build_brad/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip-4lSNM3-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip_build_brad/lxml
  Exception information:
  Traceback (most recent call last):
    File "/Library/Python/2.7/site-packages/pip-1.5.4-py2.7.egg/pip/basecommand.py", line 122, in main
      status = self.run(options, args)
    File "/Library/Python/2.7/site-packages/pip-1.5.4-py2.7.egg/pip/commands/install.py", line 283, in run
      requirement_set.install(install_options, global_options, root=options.root_path)
    File "/Library/Python/2.7/site-packages/pip-1.5.4-py2.7.egg/pip/req.py", line 1435, in install
      requirement.install(install_options, global_options, *args, **kwargs)
    File "/Library/Python/2.7/site-packages/pip-1.5.4-py2.7.egg/pip/req.py", line 706, in install
      cwd=self.source_dir, filter_stdout=self._filter_install, show_stdout=False)
    File "/Library/Python/2.7/site-packages/pip-1.5.4-py2.7.egg/pip/util.py", line 697, in call_subprocess
      % (command_desc, proc.returncode, cwd))
  InstallationError: Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip_build_brad/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip-4lSNM3-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/var/folders/3c/mdys56lx2wbf9rjlmqy4nhy40000gn/T/pip_build_brad/lxml
  </code></pre>
  
  <p>Creating the symlink (<a href="https://stackoverflow.com/a/19549645/1399659">https://stackoverflow.com/a/19549645/1399659</a>) didn't help either.</p>
  
  <p>Ideas appreciated, thanks</p>