Compile antiquated fortran?

[Allin Cottrell <cottrell@wfu.edu>]

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I have old fortran source code (not my own work) for a specialized 
statistical program that I and others find quite useful.

A few years ago I was able to compile it on Linux using gfortran 
with std=legacy (and also cross-compile it for Windows an Mac). Now 
I'd like to rebuild it, but with recent gfortran (I've tried 12.2.1 
on Fedora and 13.1.1 on Arch) it's a no-go. I get lots of errors of 
the following sort:

ansub9.f:151:44:

   151 |    INTEGER ITYPE,INIT,LAM,IMEAN,IP,ID,Q,BP,BD,BQ,SQG,MQ,L,M,
       |                                       1
Error: Symbol ‘q’ at (1) already has basic type of REAL

I can understand this complaint. The code contains this sort of 
thing within a given subroutine:

        IMPLICIT  REAL*8 (A-H,O-Z)

then some lines later on:

        INTEGER ITYPE,INIT,LAM,IMEAN,P,D,Q,...

I guess the author was assuming that an explicit type-assignment 
just overrides an implicit one. Older gfortran apparently played 
along with that.

My question: Given that I'm already using -std=legacy, are there any 
other flags that I could add to get the code to compile?

(I know I could tackle this by renaming a bunch of variables, but in 
context that would be an extremely fiddly job.)

Thanks for any help.

-- 
Allin Cottrell
Department of Economics
Wake Forest University