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answered 2013-10-07 10:12:13 -0500

joq gravatar image

It mostly is redundant.

Some system dependencies declare non-standard CMake variables, so the CMake interface does need to be spelled out explicitly somewhere, and CMakeLists.txt is a reasonable choice.

Because CMake scripts are not easy for other tools to parse, some information is duplicated in package.xml, where it is more-readily accessible.