Mine

set (prefix ${CMAKE_INSTALL_PREFIX}                   CACHE PATH "prefix")
set (exec_prefix ${CMAKE_INSTALL_PREFIX}/bin          CACHE PATH "bindir")
set (libdir ${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX}  CACHE PATH "libdir")
set (includedir ${CMAKE_INSTALL_PREFIX}/include       CACHE PATH "includedir")
set (datadir ${CMAKE_INSTALL_PREFIX}/share            CACHE PATH "datadir")