MadGraph5_aMC@NLO

fortran compiler error on macOS v10.13

Asked by Kong Weijun

Hi,
I am using macOS system v10.13 and met a problem about fortran . From other questions
 I learn that gcc8 is not supported yet so I switched to gcc7 and gcc5(installed with homebrew) , I am following the tutorial
,in running "output MY_FIRST_MG5_RUN" I got an error like the follows:

Error detected in "output MY_FIRST_MG5_RUN"
write debug file MG5_debug
If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
MadGraph5Error : No Fortran Compiler detected! Please install one

in shell I test the following command:

which fortran-5
/usr/local/bin/gfortran-5

what is the problem with my system?
Thanks!

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Solved by:
Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

gfortran-5 is not a standard name for the compiler and we did not check for that executable

You can either add a symbolic link such that "which gfortran" works (and point to gfortran-5)
or you can set the path "/usr/local/bin/gfortran-5" inside the file input/mg5_configuration at the line specifying which compiler to use.

Cheers,

Olivier

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Kong Weijun (kongweijun) said : 		#2

Thanks for your help.
My problem was due to my gcc package was not complete。I have reinstall the correct gcc package.