MadGraph5_aMC@NLO

Fortran Compiler not detected by MG5_aMC

Asked by Grant

When I try to output the result of a process as it says to do in the tutorial using the command "output MY_FIRST_MG5_RUN", I get the following error:
Error detected in "output MY_FIRST_MG5_RUN"
write debug file MG5_debug
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str : No Fortran Compiler detected! Please install one

I've installed a fortran compiler from this link: https://hpc.sourceforge.net/

Specifically, I installed gfortran-11.2-bin.tar.gz as I am on an intell i5 mac running Monterey
I also tried installing gcc-11.2-bin.tar.gz and ran into a similar issue

I've tried both moving the gfortran executable and the entire usr folder into the MG5_aMC_v3_5_3 folder, and I've also tried manually inputting the path for the gfortran executable into the mg5_configuration.txt file, but I still get the same error.

How do I fix this?

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

From your source, it is typically enough to follow their instructions and then mg5aMC will detect it.
So you likely uncompress the files in a wrong location.
You can check by opening a bash terminal and type "gfortran" if bash complains that gfortran does not exists, then re-install it up to the point that the above is working.

Cheers,

Olivier

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