could not find a working compiler (gmp 6.2.1)

[S]

I just updated the OS (linux mint 21) on four machines, and then 
installed gmp 6.2.1 on each machine using the same tar file.  The 
installation was successful on three of the four machines, but failed on 
the last one because ./configure "could not find a working compiler" 
even though gcc is present.  I also tried  ./configure 
CC=/usr/local/bin/gcc to no avail.  I have sent along the config.log 
file.  Your help is most appreciative.  THANKS!

(in case this matter: Previously I installed gmp 6.1.2 on all four 
machines before I updated the OS.  I also tried to install 6.1.2 on this 
last machine but I got the same error.  The four machines are not 
identical.)
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