I have been able to build clang using MSYS using the instructions on the clang web site. Everything appears to have built correctly except for a problem building the llvm sample program which I reported, and nobody has responded to. So I will ignore the problem as I see I have a clang.exe and a clang++.exe in the build/llvm/Debug+Asserts/bin directory. I have a number of questions: 1) Do I need to re-run 'configure' followed by 'make' each time I get the latest llvm and clang from SVN, or is running 'make' good enough. 2) How does clang find its headers and libraries ? In the clang User Manual under "Operating System Features and Limitations" for Mingw32 it says: "MinGW32 Clang works on some mingw32 distributions. Clang assumes directories as below; C:/mingw/include C:/mingw/lib C:/mingw/lib/gcc/mingw32/4.[3-5].0/include/c++" This is a little confusing to me. When running clang, built through MSYS, does clang understands Windows paths or does it need to be run from within MSYS and therefore understand only Linux-like paths ? The note suggests the former. 3) Can clang handle the Windows header files used by gcc in its include directory as specified above ? 4) What is the difference between clang and clang++.exe ? I do not mean to be critical because I know that many developers are working to make clang better, but the online Users Manual is pretty sparse in information, so I am hoping someone can help me here or point me to better explanations. I want to use clang to test out Boost libraries on which I am working. I heavily prefer staying on Windows so I am hoping I can use clang there. Thanks !