ENH: Add CPACK_SET_DESTDIR handling to enable packaging of installed files in absolute locations. With this setting on, cpack will set the DESTDIR env var when building the package so that files end up in their intended locations. Default behavior is not to set DESTDIR for backwards compatibility. Helps address issue #4993 and issue #5257. Also, remove unused CPACK_USE_DESTDIR variable. ENH: Add variable CPACK_PACKAGING_INSTALL_PREFIX to allow overriding the CPack GetPackagingInstallPrefix from a project's CMakeLists file if necessary. Could be used to remove the annoying /usr prefix still used by default in the Mac PackageMaker generator.

ENH: cpack changes, remove the escape variable stuff as it is not needed if you provide a config file for cpack

ENH: add ability to set installer icons, links to web pages, nsis code in the icon section of the template, and ability to escape variables correctly

Alex

CMAKE_FIND_PREFIX_PATH is both an environment variable and a cmake variable,
which is a list of base directories where FIND_PATH, FIND_FILE, FIND_PROGRAM
and FIND_LIBRARY will search in the respective subdirectories

Alex

BUG: Fix bug#5590.  When converting a relative path between two full paths on different windows drive letters do not create a ../../d:/foo/bar path and just return the full path to the destination.

to make them actually work

Alex