installing Sage on Homebrew is not supported, and most probably is badly 
broken.

On Saturday, 6 February 2016 01:32:08 UTC, Andrew Pennebaker wrote:
>
> After `brew cask install sage`, the resulting sage install complains that 
> it didn't compile properly.
>
> $ brew cask install sage
> ...
>
> $ sage
> RuntimeError: maximum recursion depth exceeded during compilation
> ┌────────────────────────────────────────────────────────────────────┐
> │ SageMath Version 6.10, Release Date: 2015-12-18                    │
> │ Type "notebook()" for the browser-based notebook interface.        │
> │ Type "help()" for help.                                            │
> └────────────────────────────────────────────────────────────────────┘
> The Sage installation tree has moved
> from 
> /Users/buildslave-sage/slave/binary_pkg/build/source/SageMath/jc4b6yulaujayb9sr94ia88eourzeqip0oidma
>   to 
> /opt/homebrew-cask/Caskroom/sage/6.10/SageMath-6.10.app/Contents/Resources/sage
> Updating various hardcoded paths...
> (Please wait at most a few minutes.)
> DO NOT INTERRUPT THIS.
> Done updating paths.
> Traceback (most recent call last):
>   File 
> "/opt/homebrew-cask/Caskroom/sage/6.10/SageMath-6.10.app/Contents/Resources/sage/src/bin/sage-ipython",
>  
> line 8, in <module>
>     from sage.repl.readline_extra_commands import *
> ImportError: 
> dlopen(/opt/homebrew-cask/Caskroom/sage/6.10/SageMath-6.10.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/repl/readline_extra_commands.so,
>  
> 2): Library not loaded: 
> /Users/buildslave-sage/slave/binary_pkg/build/source/SageMath/jc4b6yulaujayb9sr94ia88eourzeqip0oidma/local/lib/libreadline.6.dylib
>   Referenced from: 
> /opt/homebrew-cask/Caskroom/sage/6.10/SageMath-6.10.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/repl/readline_extra_commands.so
>   Reason: image not found
>
> $ specs brew os
> specs --version
> 0.21
>
> brew --version
> Homebrew 0.9.5 (git revision 97159; last commit 2016-02-06)
>
> system_profiler SPSoftwareDataType | grep 'System Version'
>     System Software Overview:
>       System Version: OS X 10.11.3 (15D21)
>       System Integrity Protection: Enabled
>
> ~$ specs sage brew os
> specs --version
> 0.21
>
> sage --version
> RuntimeError: maximum recursion depth exceeded during compilation
> SageMath Version 6.10, Release Date: 2015-12-18
>
> brew --version
> Homebrew 0.9.5 (git revision 97159; last commit 2016-02-06)
>
> system_profiler SPSoftwareDataType | grep 'System Version'
>     System Software Overview:
>       System Version: OS X 10.11.3 (15D21)
>       System Integrity Protection: Enabled
>

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