tianshuo_1 wrote: > I try to build llvm-gcc-4.2-2.6.source before build and install > llvm-2.6, the configure is shown bellow You need to build llvm first. --enable-llvm (and not -enable-llvm) should point to the directory in which you built llvm (this may be the same as the llvm source directory if you built llvm in place). Best wishes, Duncan.