gfortran 9.3 write format error

[Charles Russell]

Problem solved (probably).

When setting out to downgrade gfortran, I found that there was a slight 
upgrade available - 9.3.0.1 to 9.3.0.2. I upgraded, ran "make clean" and 
"make test".  This time it ran to completion with no error message.

Seems unlikely this minor upgrade fixed a major problem.  More likely, 
reinstalling gfortran was what fixed it.

I was having similar problems with other programs, not just this one, 
and time will tell whether upgrading fixed everything.