Do not install documentation, it's handled by debhelper commands.
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -90,5 +90,5 @@
 ADD_SUBDIRECTORY(doc)
 
 # Install README, VERSION, LICENSE.GPL and other raw txt files
-INSTALL(FILES AUTHORS DEVELOPERS LICENSE.GPL NEWS README VERSION DESTINATION "${CMAKE_INSTALL_PREFIX}/${CANORUS_INSTALL_DATA_DIR}")
+# INSTALL(FILES AUTHORS DEVELOPERS LICENSE.GPL NEWS README VERSION DESTINATION "${CMAKE_INSTALL_PREFIX}/${CANORUS_INSTALL_DATA_DIR}")
 
