[Boost-users] Compatible question with STLPORT

Dear sir, When I include STLPORT in VS 2005 as follows: VC++ Directories -> Include files ->STLPORT-5.1.2\stlport This "Options" is set in the first line. However there's compiling errors: boost\include\boost-1_33_1\boost\config\auto_link.hpp(175) : fatal error C1189: #error : "Build options aren't compatible with pre-built libraries". When I delete STLPORT-5.1.2 from "Options", there's no compiling error. But why? Thanks.