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Moreover it shows me “Permission denied”.The way I overcome it is by running “sudo su” then “flair”.Is this the reason i am unable to build the executable.
The needful appears to be on your side: the flair Permission denied issue was just discussed today, while the compilation error is clearly displayed in red as directory is not found or not set (set the Fluka Directory in the Flair Config panel).
Please set the correct FLUKA directory in Preferences, which is not /usr/local/flair but /usr/local/fluka.
Moreover, the user routine name should not contain any blank nor parenthesis (rename frghns (1).f to frghns.f or whateverfrghns.f).