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+CPACK_PACKAGING_INSTALL_PREFIX
+------------------------------
+
+The prefix used in the built package.
+
+Each CPack generator has a default value (like /usr). This default
+value may be overwritten from the CMakeLists.txt or the cpack command
+line by setting an alternative value.
+
+e.g. set(CPACK_PACKAGING_INSTALL_PREFIX "/opt")
+
+This is not the same purpose as CMAKE_INSTALL_PREFIX which is used
+when installing from the build tree without building a package.