Re: where can / must one activate 'LONG DOUBLES'?

configure --with-long-double

(or autogen.sh --with-long-double if you are running from the git tree
which, since you were looking for the test suite
the other day you should be)

goffice will need to have been compiled with --with-long-double also.

Note: this code path isn't tested terribly often.

M.