* lib/Automake/Variable.pm (define, _new): Remember the helper variable created for the last conditional += on each variable, and only append further += in the same condition to this last helper variable, not to older helper variables. This way the order of the items appended to the variable is preserved. * tests/cond21.test: Adjust. * tests/cond38.test: New file. * tests/Makefile.am (TESTS): Add cond38.test. Report from Ed Hartnett.