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?

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