title: Could not find xmlsec1 config. Are libxmlsec1-dev and pkg-config installed?
body: <p>This is happing especially on RHEL
  Already installed this packages  yum install libxml2-devel xmlsec1-devel xmlsec1-openssl-devel libtool-ltdl-devel</p>
  
  <pre><code>Could not find xmlsec1 config. Are libxmlsec1-dev and pkg-config installed
  
  
  Command "/usr/local/pyenv/versions/3.6.5/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-ucm4xpg5/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 /tmp/pip-record-gr0ttbdf/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-install-ucm4xpg5/xmlsec/
  </code></pre>
  
  <p>Why I am getting this error Even though I installed the required packages</p>