From Rene Molenaar, "I have found a problem regarding manifest in the plugins,

see http://www.openscenegraph.org/projects/osg/browser/OpenSceneGraph/trunk/src/CMakeLists.txt
the option OSG_MSVC_GENERATE_PLUGINS_AND_WRAPPERS_MANIFESTS is set to ON only after the subdirectories are added,
this causes /MANIFEST:NO while the option is ON after the first configure, generate.

if this option is moved (i.e. above the ADD_SUBDIRECTORY statement) results are as expected.

attached you will find the correct CMakeLists.txt
"

src/CMakeLists.txt

@@ -2,6 +2,10 @@ IF(ANDROID)
     SET(MODULE_USER_STATIC_OR_DYNAMIC ${OPENSCENEGRAPH_USER_DEFINED_DYNAMIC_OR_STATIC})
 ENDIF(ANDROID)
 
+IF(MSVC80 OR MSVC90)
+  OPTION(OSG_MSVC_GENERATE_PLUGINS_AND_WRAPPERS_MANIFESTS "Generate or not manifests files under VS8 for dynamically loaded dlls" ON)
+ENDIF()
+
 #the old construct SUBDIRS( was substituded by ADD_SUBDIRECTORY that is to be preferred according on CMake docs.
 FOREACH( mylibfolder 
         OpenThreads
@@ -34,10 +38,6 @@ IF (QT4_FOUND AND NOT ANDROID)
     ADD_SUBDIRECTORY(osgQt)
 ENDIF()
 
-IF(MSVC80 OR MSVC90)
-  OPTION(OSG_MSVC_GENERATE_PLUGINS_AND_WRAPPERS_MANIFESTS "Generate or not manifests files under VS8 for dynamically loaded dlls" ON)
-ENDIF()
-
 IF(ANDROID)
     configure_file("${OSG_ANDROID_TEMPLATES}/Android.mk.src.in" "${CMAKE_CURRENT_BINARY_DIR}/Android.mk")
 ENDIF()