From Wang Rui, "The Python header will look for its libraries using "#pragma comment(lib,"python32_d.lib")" for MSVC. So user-specified libraries will not really be set for the osgdb_python plugin. This small fix may help locate the Python libraries after putting the CMakeLists.txt into src/osgPlugins/python

"

src/osgPlugins/python/CMakeLists.txt

@@ -9,5 +9,10 @@ SET(TARGET_SRC
 SET(TARGET_EXTERNAL_LIBRARIES ${TARGET_EXTERNAL_LIBRARIES} ${PYTHON_LIBRARY})
 INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIR} )
 
+IF(MSVC)
+    GET_FILENAME_COMPONENT(PYTHON_LIB_DIR ${PYTHON_LIBRARY} PATH)
+    LINK_DIRECTORIES(${PYTHON_LIB_DIR})
+ENDIF(MSVC)
+
 #### end var setup  ###
 SETUP_PLUGIN(python)