add incremental flag for builds (was implicit under certain conditions)
add incremental flag for builds (was implicit under certain conditions)


Former-commit-id: c594b0ee295c1729f5103e57262f8454fb17a999
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine