[gentoo-devhelp] Where should libraries be installed with cmake?

[Nikos Chantziaras]

I'm creating a cmake file for a project. According to the cmake docs, 
this is how I should install libraries:

   install(TARGETS MyLibrary DESTINATION lib)

This installs the library files into ${CMAKE_INSTALL_PREFIX}/lib. With a 
"/usr" prefix, that's simply "/usr/lib".

But this doesn't look correct to me. What about "/usr/lib/lib64"? And I 
can't just use "lib64", since that means the library will end up in the 
wrong place on 32-bit systems.

How do I handle this? The cmake documentation provides zero help on 
this. With autoconf, this wasn't a problem, since there are variables 
for the various install paths. cmake seems to give me nothing of the sort?