This use of bufferoverflowU.lib needs to be only used when the compiler is a VS2005 flavored compiler, not for VS2008 or VS2010.
hotspot/agent/src/os/win32/windbg/Makefile:LIBS_AMD64= $(WINDBG_LIB_AMD64)/dbgeng.lib bufferoverflowU.lib \
hotspot/agent/src/os/win32/windbg/Makefile:LIBS_AMD64= $(WINDBG_LIB_AMD64)/dbgeng.lib bufferoverflowU.lib \