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infrastructure and using that infrastructure in programs. * MKHESIOD, MKKERBEROS, MKSKEY, and MKYP control building of the infratsructure (libraries, support programs, etc.) * USE_HESIOD, USE_KERBEROS, USE_SKEY, and USE_YP control building of support for using the corresponding API in various libraries/programs that can use it. As discussed on tech-toolchain.