New in version 3.12.
The homepage URL of the project.
This is the homepage URL given to the most recently called project() command in the current directory scope or above. To obtain the homepage URL of the top level project, see the CMAKE_PROJECT_HOMEPAGE_URL variable.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/PROJECT_HOMEPAGE_URL.html