Python 3.3 on Mac OSX means we need a compiler

[gnunicorn]

When installing flask it fails when trying to compile markupsafe in the python3.3 environment on a mac without a c-compiler. It works fine with the python2.7 version though.

Sophies choice: Shall we change the python version in the tutorial to 2.7 for mac or do we have to require to have xcode installed?

[meehow]

On Ubuntu LTS python 2.7 is installed by default as well.

[Ivoz]

Could you copy the output of pip?

From what I can see it should try to build, fail, and then run the setup normally without compilation speedups.

https://github.com/mitsuhiko/markupsafe/blob/master/setup.py#L119-L122

I definitely agree we shouldn't be asking os x users to install xcode just for this, but as far as I can see the C compilation for that package should be optional, not mandatory.