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Why a TriBITS Package is not a CMake Package
Note that a TriBITS Package is not the same thing as a "Package" in raw CMake terminology. In raw CMake, a "Package" is some externally provided bit of software or other utility for which the current CMake project has an optional or required dependency (see CMake: How to Find Libraries). Therefore, a raw CMake "Package" actually maps to a TriBITS TPL. A raw CMake "Package" (e.g. Boost, CUDA, etc.) can be found using a standard CMake find module Find<rawPackageName>.cmake using the built-in CMake command find_package(<rawPackageName>). It is unfortunate that the TriBITS and the raw CMake definitions of the term "Package" are not exactly the same. However, the term "Package" was coined by the Trilinos project long ago before CMake was adopted as the Trilinos build system and Trilinos' definition of "Package" (going back to 1998) pre-dates the development of CMake (see History of CMake) and therefore Trilinos dictated the terminology of TriBITS and the definition of the term "Package" in the TriBITS system. However, note that both meanings of the term "Package" are consistent with the more general software engineering definition of a "Package" according to Software Engineering Packaging Principles.