Hi I am using boost 1.32.0 libraries along with STLPort4.6.2 on .Net2003 VC7.1. The release version of the Project compiles and runs successfully, but the Debug version gives the following error: warning: STLPort debug versions are built with /D_STLP_DEBUG=1 c:\SourceLibrary\Boost\boost_1_32_0\boost\config\auto_link.hpp(170) : fatal error C1189: #error : "Build options aren't compatible with pre-built libraries" I have included _STLP_DEBUG in the C++ Preprocessor settings for the Debug Version.. Can anyone help me?? Thanks in advance. Manish Mangal Stratagen Systems 1-425.821.8454 ext. 136