gfortran error in installation of cbc

[Jan V.]

Hi,

as mentioned in 

https://pypi.org/project/sage-numerical-backends-coin/10.4rc2/

I tried to run the command "sage -i cbc" in order to resolve an error occuring in an installation of a tool using Gurobi, as the file '/opt/sage_numerical_backends_gurobi-9.3.1.tar.gz' does not exist on my pc. However, installing cbc results in an error due to gfortran, see the log-file, which is zipped due to its excessive size. 

Thanks in advance for your help!

Jan

[Matthias Koeppe]

Please try with a more recent version of Sage (yours is 10.0.beta2 per config.log; we have updated gfortran since then) and in particular https://github.com/sagemath/sage/pull/38319, which updates the sage-numerical-backends-... packages.

10.0.beta2

[Dima Pasechnik]

Can you just install and use Homebrew gfortran (a part of gcc package) ?

I don't really think Sage should be in business of helping users to install Fortran on their Apple machines - at least without appropriate funding from Apple :-)

[Jan V.]

I have now updated sage to the current version (10.4.rc1), and the problem is solved. Thanks for the advice!