On Tuesday, March 6, 2018 at 11:56:59 PM UTC, Matthew Lancellotti wrote:
> sage: latest version (8.1) (from https://github.com/sagemath/sage, last 
> updated Dec 17, 2017).  tried both master branch and develop branch.
> OS: Mac OSX 10.13.3
> Xcode version 9.0.1
> I cloned the latest version of sage from the git repository.  When 
> attempting to `make` sage, I run into the error `The following package(s) 
> may have failed to build...gfortran-7.2.0`.  I will attach the log file 
> shortly.  Near the bottom of the file it says:
>     The directory that should contain system headers does not exist:
>       /usr/include
>     make[5]: *** [stmp-fixinc] Error 1
>     make[5]: *** Waiting for unfinished jobs....
>     rm gcc.pod gfortran.pod
>     make[4]: *** [all-gcc] Error 2
>     make[3]: *** [all] Error 2
> I tried using brew to manually install gfortran.  Brew said that it ships 
> with gcc.  I used brew to update my system to the latest version of gcc.  
> It didn't help.  Currently, I am updating my Xcode to 9.2 to see if that 
> helps.  Also, should my "system headers" exist?  If so, where are they?

System headers should be in /usr/include
You also need XCode's command line tools to be installed.

It could be that presence of Homebrew in your PATH breaks things.

As well, please tell us the sequence of commands you executed.
Did you run ./bootstrap and
./configure (with what parameters?)
before running make?


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