> I’ll see how to fix it.  In the meantime, you can, ahem, run
> ‘make uninstall’ or ‘make install’...

I'm not sure, but I think that 'make uninstall' solved the problem.

> Can you provide more details?  It appears to build for me as
> /nix/store/2kdr905aj5kkm0mrwjqxsgv6zvmh2y0j-bison-2.6.1 (x86_64-linux).

I've attached the part of 'testsuite.log'.

Nikita