I've tweaked the IRAF spec files some more. They are in https://github.com/joequant/iraf in the debug branch under the rpm directory. The main changes involved setting up the environment variables to be a bit more robust.
I've also done work on getting IRAF to work with gfortran. It's not working, but I've gotten it to compile, and I think I know what the main problem is. The trouble is that rpp generates code that looks like Integer Memi(1) Common /mem/ memd equivalence (memi, memd) The trouble is that in f90, the compiler optimizes out array overflows, so that this won't work to get a memory pointer. I tried a few workarounds, they work, but they aren't clean. The correct fix should be to generate code that looks like Integer, pointer:: memi memi = memd
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