Users build with "gmake pkg.tgt" using the SRT targets.
D0 SRT must be modified to call a CTBUILD interface instead of
the GNUmakefile for each package. Or users could provide an
appropriate package GNUmakefile to call this interface.
Would this interface be part of SRT or CTBUILD?
Maintenance of this interface will be something of a headache
as it depends on both CTBUILD and SRT.
Use the CTBUILD interface:
This probably means putting a thin layer over CTBUILD. Maybe
users build with "d0build pkg tgt".