Intent is to allow filtering by arbitrary flag combinations. This isn't actually working yet. No idea why. It seems it should. Tired though, so will look at it tomorrow.
if(WIN32 AND NOT UNIX)
file(GLOB DLLs *.dll)
file(GLOB ICOs *.ico)
install(FILES
${DLLs}
${ICOs}
DESTINATION ${target_library_install_dir})
endif(WIN32 AND NOT UNIX)