I'm having difficulties building boost 1.34.1 using the intel toolchain. Once bjam tries to invoke the compiler, I get the "Windows cannot open this file" dialog, where the file is an .obj.rsp file. It would appear that perhaps the compiler itself is not making it into the command line, thus causing the system to try executing the .rsp file directly. I am not having this problem if I use the msvc toolchain. Command to invoke the build: bjam --toolset=intel-9.1 Compiler: Intel(R) C++ Compiler for 32-bit applications, Version 9.1 Build 20060519Z bjam: Boost.Jam Version 3.1.14. OS=NT. Some environment variables: ICPP_COMPILER91=C:\Program Files\Intel\Compiler\C++\9.1 INTEL_BASE_MSVC_TOOLSET=vc-7_1 INTEL_LICENSE_FILE=C:\Program Files\Common Files\Intel\Licenses INTEL_PATH=C:\Program Files\Intel\Compiler\C++\9.1\Ia32 INTEL_SHARED=C:\Program Files\Common Files\Intel\Shared Files I've run the iclvars batch script, icl.exe is on the path, and I've used this environment to build boost 1.33 successfully. I've tried various debug levels of bjam, and I haven't seen anything that makes a problem obvious to me. Thanks James