Hi Beman, A couple of comments on RC2. It builds fine with the darwin toolset (gcc 4.0.1) on an Intel core2 running Tiger. All the documentation links I checked worked okay. There're a couple of issues building with the Intel compilers under Tiger (the intel-darwin toolset). (1) The configure script doesn't recognize the intel-darwin toolset. I've attached patches to both tools/jam/src/build.sh and tools/jam/ src/build.jam so the intel-darwin toolset is recognized. With these patches, users with intel compilers on the Mac should be able to: ./configure --with-toolset=intel-darwin ; make (2) Python fails to compile when the intel compilers generate 64 bit code, the fix is to build 32 bit if you need python. (3) The address-model property in intel-darwin.jam isn't properly configured. I've attached a patch to fix tools/build/v2/tools/intel- darwin.jam to make this work with address-model=32,64. (4) The regex library (built shared as a dylib), doesn't link due to, apparently, missing symbols in the runtime. __ZNSt15basic_streambufIwSt11char_traitsIwEE8overflowEj __ZNSt15basic_streambufIwSt11char_traitsIwEE9pbackfailEj (5) The filesystem library (built shared) fails to link building 32 bit for an internal link error. ld: internal error: output_local_symbols() inconsistent local symbol count -- Noel