This directory (contrib) contains KNO cmodules which are maintained in separate repositories, set up as GIT submodules. The commands domake and submake provide handy ways to operate on these subdirectories. Each takes a series of either submodule names (which are subdirectories of src/extmods) and make targets (anything else). It then iterates over the specified submodules and calls make in each subdirectory with the specified targets.

The difference between submake and domake is that submake passes DEFINEs to the make call which cause it to refer to the current build. This includes specifying a variant version of knoconfig which gets headers and libraries from the current (enclosing) source tree and a COPY_CMODULES definition which causes built modules to be stored in the source tree's lib/kno directory.