I'm trying to compile WebKit (with some modification) using both build-webkit and Visual Studio 2005 IDE. When I'm modifying the code the IDE is convenient, while on rebuilding build-webkit script is faster (for it's multiprocessor feature). But they generate different .pch file when compiling WebCore. And in a few case build-webkit fails to compile while IDE succeeds. In a case, the error message was 'error C3861: 'GdiAlphaBlend': no such identifier' (the original message was in Korean, so I translated it; so the exact message in English may somewhat different) Apparently GdiAlphaBlend is not getting defined. But IDE compiles it successfully - only if I recompile WebCorePrefix.cpp which (re)generates the .pch file. (BTW, GdiAlphaBlend isn't in the original WebCore code. it's in my modification.) My description is somewhat vague, but I'll be happy if I get some hint for this... Thanks in advance. ---------- Taeyun Kim