Installation Troubleshooting

MacPorts Conflicts

$ sudo easy_install pycurl
...
Using curl-config (libcurl 7.21.1)
In file included from /opt/local/include/curl/curl.h:35,
                 from src/pycurl.c:50:
/opt/local/include/curl/curlrules.h:143: error: size of array ‘__curl_rule_01__’ is negative
/opt/local/include/curl/curlrules.h:153: error: size of array ‘__curl_rule_02__’ is negative
In file included from /opt/local/include/curl/curl.h:35,
                 from src/pycurl.c:50:
/opt/local/include/curl/curlrules.h:143: error: size of array ‘__curl_rule_01__’ is negative
/opt/local/include/curl/curlrules.h:153: error: size of array ‘__curl_rule_02__’ is negative
lipo: can't open input file: /var/tmp//ccv51A3x.out (No such file or directory)
error: Setup script exited with error: command 'gcc-4.2' failed with exit status 1

This error indicates a conflict between the system version of libcurl (7.19.7 on OS X 10.6) and a more recent version installed by MacPorts. To work around the problem, force the use of the system version of libcurl with PATH=/usr/bin:$PATH sudo easy_install pycurl. Alternately, you can install python and pycurl via MacPorts (sudo port install python26 py26-curl) and use those instead of the system versions.

Windows Conflicts

If you want to build the 'tornado.speedups' extension, you will need a Visual Studio compiler. The latest Visual Studio 2013 Community can be used.

To install with pip and Python 2 using Visual Studio 2013, trick into thinking Visual C++ 9:

SET VS90COMNTOOLS=%VS120COMNTOOLS%

For pip and Python 3 and Visual Studio 2013, trick into thinking Visual C++ 10:

SET VS100COMNTOOLS=%VS120COMNTOOLS%

Then proceed with the pip install tornado. You might needs quotes if there are spaces in the path.