trying to use autoconf 2.68 as Ubuntu 12.04 (travis) does not have autoconf 2.69
trying to use autoconf 2.68 as Ubuntu 12.04 (travis) does not have autoconf 2.69

hanw/p4c-bm,ops-p4/ops-p4c,hanw/p4c-bm,p4lang/p4c-bm,hanw/p4c-bm,ops-p4/ops-p4c,ops-p4/ops-p4c,p4lang/p4c-bm,ops-p4/ops-p4c,p4lang/p4c-bm,hanw/p4c-bm