I configure and package my library using CMake and CPack. I have written my own find-module: FindMyLib.cmake.
FindMyLib.cmake
How do I tell CMake/CPack to add this file
You can set CMAKE_MODULE_PATH and distribute your custom FindFoo.cmake with your project. For example:
CMAKE_MODULE_PATH
FindFoo.cmake
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")