[CMake] How to installing cmake Config.cmake files under Debian multiarch ?

[Alexander Neundorf]

Hi,

until recently, I recommended to install Config.cmake files more or less like 
this:

install(FILES FooConfig.cmake DESTINATION lib${LIB_SUFFIX}/cmake/Foo )

with LIB_SUFFIX being "64" on systems where this is required.

How do I do this on a Debian multiarch system ?
How do I know in which directory I should install ?

Alex