Bug#848859: getfem++: FTBFS randomly (failing tests)

[Santiago Vila]

BTW: We are deviating from this particular bug.

It was marked as unreproducible after building it just 5 times.

As I've explained, this is mathematically and statistically not ok.

Could anybody here please try to build a lot more times and share the
results? I see that the unreproducible tag is sometimes being used too
happily.

Thanks.