title: Unable to install pattern
body: <p>I am unable to install pattern library using </p>
  
  <pre><code>pip install pattern
  </code></pre>
  
  <p>I am getting the following error regarding <code>mysqlclient</code>. Initially I was getting error on <strong>Visual Studio</strong> which I resolved following <a href="https://stackoverflow.com/questions/29846087/microsoft-visual-c-14-0-is-required-unable-to-find-vcvarsall-bat">the thread</a></p>
  
  <pre><code>Failed building wheel for mysqlclient
    Running setup.py clean for mysqlclient
  Failed to build mysqlclient
  Installing collected packages: python-docx, mysqlclient, beautifulsoup4, pattern
    Running setup.py install for mysqlclient ... error
      Complete output from command c:\users\ashis.mohanty\appdata\local\programs\python\python37\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\ASHIS~1.MOH\\AppData\\Local\\Temp\\pip-install-e2m7rr0s\\mysqlclient\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record C:\Users\ASHIS~1.MOH\AppData\Local\Temp\pip-record-7_2in4ff\install-record.txt --single-version-externally-managed --compile:
      c:\users\ashis.mohanty\appdata\local\programs\python\python37\lib\distutils\dist.py:274: UserWarning: Unknown distribution option: 'long_description_content_type'
        warnings.warn(msg)
      running install
      running build
      running build_py
      creating build
      creating build\lib.win-amd64-3.7
      copying _mysql_exceptions.py -&gt; build\lib.win-amd64-3.7
      creating build\lib.win-amd64-3.7\MySQLdb
      copying MySQLdb\__init__.py -&gt; build\lib.win-amd64-3.7\MySQLdb
      copying MySQLdb\compat.py -&gt; build\lib.win-amd64-3.7\MySQLdb
      copying MySQLdb\connections.py -&gt; build\lib.win-amd64-3.7\MySQLdb
      copying MySQLdb\converters.py -&gt; build\lib.win-amd64-3.7\MySQLdb
      copying MySQLdb\cursors.py -&gt; build\lib.win-amd64-3.7\MySQLdb
      copying MySQLdb\release.py -&gt; build\lib.win-amd64-3.7\MySQLdb
      copying MySQLdb\times.py -&gt; build\lib.win-amd64-3.7\MySQLdb
      creating build\lib.win-amd64-3.7\MySQLdb\constants
      copying MySQLdb\constants\__init__.py -&gt; build\lib.win-amd64-3.7\MySQLdb\constants
      copying MySQLdb\constants\CLIENT.py -&gt; build\lib.win-amd64-3.7\MySQLdb\constants
      copying MySQLdb\constants\CR.py -&gt; build\lib.win-amd64-3.7\MySQLdb\constants
      copying MySQLdb\constants\ER.py -&gt; build\lib.win-amd64-3.7\MySQLdb\constants
      copying MySQLdb\constants\FIELD_TYPE.py -&gt; build\lib.win-amd64-3.7\MySQLdb\constants
      copying MySQLdb\constants\FLAG.py -&gt; build\lib.win-amd64-3.7\MySQLdb\constants
      copying MySQLdb\constants\REFRESH.py -&gt; build\lib.win-amd64-3.7\MySQLdb\constants
      running build_ext
      building '_mysql' extension
      creating build\temp.win-amd64-3.7
      creating build\temp.win-amd64-3.7\Release
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.15.26726\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Dversion_info=(1,3,13,'final',0) -D__version__=1.3.13 "-IC:\Program Files (x86)\MySQL\MySQL Connector C 6.1\include" -Ic:\users\ashis.mohanty\appdata\local\programs\python\python37\include -Ic:\users\ashis.mohanty\appdata\local\programs\python\python37\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.15.26726\ATLMFC\include" "-IC:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17134.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17134.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17134.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17134.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17134.0\cppwinrt" /Tc_mysql.c /Fobuild\temp.win-amd64-3.7\Release\_mysql.obj /Zl
      _mysql.c
      _mysql.c(29): fatal error C1083: Cannot open include file: 'mysql.h': No such file or directory
      error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\VC\\Tools\\MSVC\\14.15.26726\\bin\\HostX86\\x64\\cl.exe' failed with exit status 2
  
  
   Command
   "c:\users\ashis.mohanty\appdata\local\programs\python\python37\python.exe
   -u -c "import setuptools, tokenize;__file__='C:\\Users\\ASHIS~1.MOH\\AppData\\Local\\Temp\\pip-install-e2m7rr0s\\mysqlclient\\setup.py';f=getattr(tokenize,
   'open', open)(__file__);code=f.read().replace('\r\n',
   '\n');f.close();exec(compile(code, __file__, 'exec'))" install
   --record C:\Users\ASHIS~1.MOH\AppData\Local\Temp\pip-record-7_2in4ff\install-record.txt
   --single-version-externally-managed --compile" failed with error code 1 in
   C:\Users\ASHIS~1.MOH\AppData\Local\Temp\pip-install-e2m7rr0s\mysqlclient\
  </code></pre>