[CMake] How does find_package work?

[David Doria]

To include VXL, I do this:

FIND_PACKAGE(VXL REQUIRED)
INCLUDE(${VXL_CMAKE_DIR}/UseVXL.cmake)

How can I make my projects work like that? Say I have a /Projects/Images
folder that has a project including a CMakeLists.txt file. Then I start a
project /Projects/NewProject and I want to use some stuff from the Images
project. Now I have to do this:

set(Images /home/user/src/Projects/Images)
set(ImagesSources
${Images}/Angles.cpp
${Images}/Color.cpp
${Images}/Ray.cpp
)

Or something like that - and clearly that would not work if I went to a
different computer and had the Images directory in a different location.
How could I "find" it?

Thanks,

David
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