title: Python issue with pycurl and openssl
body: <p>I am trying to run code that uses pycurl but when I do i get the following error:</p>
  
  <pre><code>uilleann-pipes-160:data_collection Jim$ python xlsxDownloader.py
  Traceback (most recent call last):
   File "xlsxDownloader.py", line 21, in &lt;module&gt;
    from import_hedgehogs import Link
   File "/Users/Jim/Documents/Hedgehogs/hedgehogs/data_collection/import_hedgehogs.py", line 8, in &lt;module&gt;
   import pycurl
  ImportError: pycurl: libcurl link-time ssl backend (openssl) is different from compile-time ssl backend (none/other)
  </code></pre>
  
  <p>When I do "which pycurl" in terminal it gives no output so I then tried installing pycurl using "pip install pycurl". However, When I do that I get the following error:</p>
  
  <pre><code>uilleann-pipes-160:data_collection Jim$ pip install pycurl
  Collecting pycurl
   Using cached pycurl-7.43.0.1.tar.gz
  Installing collected packages: pycurl
   Running setup.py install for pycurl ... error
    Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/zw/hmv25ltn4hxcr3t9lrx7fc9r0000gn/T/pip-build-gqCefl/pycurl/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /var/folders/zw/hmv25ltn4hxcr3t9lrx7fc9r0000gn/T/pip-Vbtxf4-record/install-record.txt --single-version-externally-managed --compile:
  Using curl-config (libcurl 7.54.0)
  running install
  running build
  running build_py
  creating build
  creating build/lib.macosx-10.13-intel-2.7
  creating build/lib.macosx-10.13-intel-2.7/curl
  copying python/curl/__init__.py -&gt; build/lib.macosx-10.13-intel-2.7/curl
  running build_ext
  building 'pycurl' extension
  creating build/temp.macosx-10.13-intel-2.7
  creating build/temp.macosx-10.13-intel-2.7/src
  cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -DPYCURL_VERSION="7.43.0.1" -DHAVE_CURL_OPENSSL=1 -DHAVE_CURL_SSL=1 -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/docstrings.c -o build/temp.macosx-10.13-intel-2.7/src/docstrings.o
  
  In file included from src/docstrings.c:4:
  src/pycurl.h:164:13: fatal error: 'openssl/ssl.h' file not found
  #   include &lt;openssl/ssl.h&gt;
              ^~~~~~~~~~~~~~~
  1 error generated.
  error: command 'cc' failed with exit status 1
   ----------------------------------------
  Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/zw/hmv25ltn4hxcr3t9lrx7fc9r0000gn/T/pip-build-gqCefl/pycurl/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /var/folders/zw/hmv25ltn4hxcr3t9lrx7fc9r0000gn/T/pip-Vbtxf4-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/zw/hmv25ltn4hxcr3t9lrx7fc9r0000gn/T/pip-build-gqCefl/pycurl/
  </code></pre>