title: Failed building wheel for xmlsec - mac
body: <p>I'm installing my mac on python virtualenv environment. Whenever I install requirement packages command "pip install -r requirements.txt" i got this messages.</p>
  
  <pre><code>pip install -r requirements.txt ----------------------------------------
  Failed building wheel for xmlsec
  Running setup.py clean for xmlsec
  Failed to build xmlsec
  Installing collected packages: xmlsec, python3-saml, raven, scrypt, social-auth-app-django, social-auth-steemconnect, w3lib, voluptuous, ujson, toolz, steem
  Running setup.py install for xmlsec ... error
  Complete output from command 
  /Users/leebom/Documents/workspace/lineup/backend/venv/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/private/var/folders/p5/385n2cr95sq16x17334vsbnr0000gq/T/pip-install-xn4yfy51/xmlsec/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/p5/385n2cr95sq16x17334vsbnr0000gq/T/pip-record-kpdy8vo4/install-record.txt --single-version-externally-managed --compile --install-headers /Users/leebom/Documents/workspace/lineup/backend/venv/bin/../include/site/python3.6/xmlsec:
  running install
  running build
  running build_ext
  ************************************************************************
  Could not find xmlsec1 config. Are libxmlsec1-dev and pkg-config installed?
  
  Perhaps try: xcode-select --install
  ************************************************************************
  Command "/Users/leebom/Documents/workspace/lineup/backend/venv/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/private/var/folders/p5/385n2cr95sq16x17334vsbnr0000gq/T/pip-install-xn4yfy51/xmlsec/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/p5/385n2cr95sq16x17334vsbnr0000gq/T/pip-record-kpdy8vo4/install-record.txt --single-version-externally-managed --compile --install-headers /Users/leebom/Documents/workspace/lineup/backend/venv/bin/../include/site/python3.6/xmlsec" failed with error code 1 in /private/var/folders/p5/385n2cr95sq16x17334vsbnr0000gq/T/pip-install-xn4yfy51/xmlsec/
  </code></pre>
  
  <p>I already did the following:</p>
  
  <ul>
  <li>re-install/update my xocde commandline tool</li>
  <li>try to homebrew xmlsec packages - and result messages was it's already installed.</li>
  <li>also installed pkg-config, libxmlsec1-dev too.</li>
  </ul>
  
  <p>I have almost done everything I could find on google results... but could not accomplish the intended</p>
  
  <p>And here's my <strong>requirements.txt</strong></p>
  
  <pre><code>appdirs==1.4.3
  asn1crypto==0.24.0
  attrs==17.4.0
  awscli==1.15.81
  boto==2.49.0
  botocore==1.10.80
  certifi==2018.1.18
  cffi==1.11.5
  chardet==3.0.4
  colorama==0.3.9
  cryptography==2.2.2
  defusedxml==0.5.0
  Django==2.0.3
  django-cors-headers==2.2.0
  django-filter==1.1.0
  django-mysql==2.2.0
  django-ratelimit==1.1.0
  django-storages==1.6.6
  django-test-plus==1.0.22
  djangorestframework==3.8.2
  docutils==0.14
  dry-rest-permissions==0.1.10
  ecdsa==0.13
  funcy==1.10.1
  future==0.16.0
  futures==3.1.1
  gunicorn==19.8.1
  idna==2.6
  isodate==0.6.0
  jmespath==0.9.3
  langdetect==1.0.7
  lxml==4.2.1
  more-itertools==4.1.0
  mysqlclient==1.3.12
  oauthlib==2.1.0
  Pillow==5.1.0
  pkgconfig==1.3.1
  pluggy==0.6.0
  prettytable==0.7.2
  py==1.5.3
  pyasn1==0.4.4
  pycparser==2.18
  pycrypto==2.6.1
  pycryptodomex==3.6.1
  pyjwkest==1.4.0
  PyJWT==1.6.4
  pylibscrypt==1.7.1
  pytest==3.5.0
  pytest-django==3.1.2
  python-dateutil==2.7.3
  python-social-auth==0.3.6
  python3-openid==3.1.0
  python3-saml==1.4.1
  pytz==2018.3
  PyYAML==3.13
  raven==6.9.0
  requests==2.18.4
  requests-oauthlib==0.8.0
  rsa==3.4.2
  s3transfer==0.1.13
  scrypt==0.8.6
  six==1.11.0
  social-auth-app-django==2.1.0
  social-auth-core==1.7.0
  social-auth-steemconnect==0.0.2
  steem==1.0.0
  toolz==0.9.0
  ujson==1.35
  urllib3==1.22
  voluptuous==0.11.1
  w3lib==1.19.0
  xmlsec==1.3.3
  </code></pre>
  
  <p>Thank you.</p>