From Luigi Calori, "when we link against something that comes out from a Find... we ususally have a variable <LINK_VAR_NAME>available like OPENTHREADS_LIBRARY,

so I' ve set up a macro that uses the variable name expanded for linking, and  test if a variable ${LINK_VAR_NAME}_DEBUG
like OPENTHREADS_LIBRARY_DEBUG exists and in case uses it for linking in debug mode.
I' ve also set up FindOpenThreads to set up these variables.
I had to edit the core libraries CMakeLists to add the calls to the macros used.
I' ve tested under MSVC"

src/osgUtil/CMakeLists.txt

@@ -80,10 +80,9 @@ ADD_LIBRARY(${LIB_NAME}
 	Version.cpp
 )
 
-TARGET_LINK_LIBRARIES(${LIB_NAME}
+LINK_INTERNAL(${LIB_NAME} 	
 	osg
-	${OPENTHREADS_LIBRARY}
-	${OPENGL_LIBRARIES}
 )
+LINK_CORELIB_DEFAULT(${LIB_NAME})
 
 INCLUDE(ModuleInstall OPTIONAL)