f2c picked up before gfortran by autoconf

[sampotter]

Expected behavior

If f2c and gfortran are both installed, I found that autoconf will pick up the f77 script provided by f2c before gfortran, leading to weird results.

(Note: I was able to solve my own problem by uninstalling f77 and using CMake instead of autoconf. I didn't test whether CMake had a similar issue.)

Actual behavior

Probably an actual Fortran compiler should be picked up before the f77 script.

Where/how to reproduce the problem

• arpack-ng: release or commit (SHA)
• OS: Fedora Release 35
• compiler: gcc 11.3.1
• configure: ./configure

Steps to reproduce the problem

Run ./configure.

[fghoussen]

You can select the compiler you want with FC=whatever ./configure

[sampotter]

I'm aware. IMO, the current behavior is a bug.

[fghoussen]

Feel free to propose a PR