Copied from https://sourceforge.net/tracker/?func=detail&aid=1706223&group_id=158151&atid=806684

The macro UNITTEST_TIME_CONSTRAINT_EXEMPT is defined for TEST but not for TEST_FIXTURE.

Try:

struct simpleFix
{
};
TEST_FIXTURE(simpleFix, test)
{
  UNITTEST_TIME_CONSTRAINT_EXEMPT();
}

Candidate patch is already available at https://sourceforge.net/tracker/?func=detail&aid=2746453&group_id=158151&atid=806686