What version of libgc (the BDW garbage collector) are you using?

I'm not sure, how do I check?

Could you get a backtrace from one of the above failures? You can type
‘ulimit -c unlimited’ before running ‘make check’, so that a core file
will be dumped upon segfault; then just run ‘gdb libguile/.libs/guile
test-suite/standalone/core’ and ‘bt full’ from there.

I have tried this but the core file is not created. Is there something I'm missing?

Thanks,
Adam