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The variable `CPACK_TEMPORARY_DIRECTORY` is an internal variable that is required for proper packaging. Historically, a second variable `CPACK_TEMPORARY_INSTALL_DIRECTORY` existed as well which had the same purpose. Both variables had to be set to the same value. Otherwise, CPack would not succeed with packaging. In order to ease CPack's usage, the variable `CPACK_TEMPORARY_INSTALL_DIRECTORY` is now no longer used. However, as it cannot be guaranteed that neither of these two (internal) variables have been used in the wild, some mechanism was introduced to preserve backwards-compatibility: If one of these variables is set, the other variable will be set to the same value. If, however, both are set to different values, CPack still fails but with an explicit error-message. Fixes: #25046