----------------------------------------------------cut here----------------------------------------------------
[gfortran-7.2.0] The directory that should contain system headers does not exist:
[gfortran-7.2.0] /usr/include
[gfortran-7.2.0] make[6]: *** [stmp-fixinc] Error 1
[gfortran-7.2.0] make[5]: *** [all-gcc] Error 2
[gfortran-7.2.0] make[4]: *** [all] Error 2
[gfortran-7.2.0] ********************************************************************************
[gfortran-7.2.0] Error building gfortran-7.2.0
[gfortran-7.2.0] ********************************************************************************
[gfortran-7.2.0]
[gfortran-7.2.0] real 15m38.488s
[gfortran-7.2.0] user 11m15.916s
[gfortran-7.2.0] sys 1m42.868s
[gfortran-7.2.0] ************************************************************************
[gfortran-7.2.0] Error installing package gfortran-7.2.0
[gfortran-7.2.0] ************************************************************************
[gfortran-7.2.0] explaining the problem and including the log file
[gfortran-7.2.0] /Users/jlmartin/Downloads/sage-8.3/logs/pkgs/gfortran-7.2.0.log
[gfortran-7.2.0] Describe your computer, operating system, etc.
[gfortran-7.2.0] If you want to try to fix the problem yourself, *don't* just cd to
[gfortran-7.2.0] /Users/jlmartin/Downloads/sage-8.3/local/var/tmp/sage/build/gfortran-7.2.0 and type 'make' or whatever is appropriate.
[gfortran-7.2.0] Instead, the following commands setup all environment variables
[gfortran-7.2.0] correctly and load a subshell for you to debug the error:
[gfortran-7.2.0] (cd '/Users/jlmartin/Downloads/sage-8.3/local/var/tmp/sage/build/gfortran-7.2.0' && '/Users/jlmartin/Downloads/sage-8.3/sage' --sh)
[gfortran-7.2.0] When you are done debugging, you can type "exit" to leave the subshell.
[gfortran-7.2.0] ************************************************************************
make[3]: *** [/Users/jlmartin/Downloads/sage-8.3/local/var/lib/sage/installed/gfortran-7.2.0] Error 1
make[2]: *** [all-start] Error 2
real 71m31.729s
user 32m26.705s
sys 7m9.172s
***************************************************************
Error building Sage.
The following package(s) may have failed to build (not necessarily
during this run of 'make all-start'):
* package: gfortran-7.2.0
log file: /Users/jlmartin/Downloads/sage-8.3/logs/pkgs/gfortran-7.2.0.log
build directory: /Users/jlmartin/Downloads/sage-8.3/local/var/tmp/sage/build/gfortran-7.2.0
The build directory may contain configuration files and other potentially
helpful information. WARNING: if you now run 'make' again, the build
directory will, by default, be deleted. Set the environment variable
SAGE_KEEP_BUILT_SPKGS to 'yes' to prevent this.
make[1]: *** [all-start] Error 1
make: *** [all] Error 2