Fix warnings

• hide warnings from external packages
• fixed missing override warnings

Alignment/AlignEvent/CMakeLists.txt

@@ -13,6 +13,10 @@ include(GaudiObjDesc)
 
 god_build_headers(xml/*.xml)
 
+find_package(CLHEP)
+find_package(ROOT)
+include_directories(SYSTEM ${CLHEP_INCLUDE_DIRS} ${ROOT_INCLUDE_DIRS})
+
 gaudi_add_library(AlignEvent
                   src/*.cpp
                   NO_PUBLIC_HEADERS