This variable may be set to a path to install to when cross-compiling. This can be useful if the path in CMAKE_SYSROOT is read-only, or otherwise should remain pristine.
The CMAKE_STAGING_PREFIX location is also used as a search prefix by the find_* commands. This can be controlled by setting the CMAKE_FIND_NO_INSTALL_PREFIX variable.
If any RPATH/RUNPATH entries passed to the linker contain the CMAKE_STAGING_PREFIX, the matching path fragments are replaced with the CMAKE_INSTALL_PREFIX.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_STAGING_PREFIX.html