The run-time search path (rpath) defines paths to search for dynamic libraries when executing a program. It is a mechanism on Linux parallel to the LD_LIBRARY_PATH environment variable, which is another hint to find dynamic libraries.

Usually, it is a good idea to make software which you built relocatable. This means that created binaries can be moved around and they still work after the location change. This includes the ability to still find the correct versions of dynamic libraries. One simple way to achieve this is by setting the rpath relative to the current location of the binary. In CMake this can be achieved like this:

# for all binaries created in a CMake project:
# for certain targets
SET_TARGET_PROPERTIES(target 1 target2 ...

Please note that the backslash is required.