Hi all, hope this is the right list for my question. So here it goes: When it try to use boost using a proprietary MPIC++ compiler I have no control over, I get the following errors: In file included from ../boost_1_43_0/boost/thread/detail/platform.hpp:17, from ../boost_1_43_0/boost/thread/thread.hpp:12, from ../boost_1_43_0/boost/thread.hpp:13, from test.cpp:37: ../boost_1_43_0/boost/config/requires_threads.hpp:47:5: error: #error "Compiler threading support is not turned on. Please set the correct command line options for threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)" In file included from ../boost_1_43_0/boost/thread/thread.hpp:12, from ../boost_1_43_0/boost/thread.hpp:13, from test.cpp:37: ../boost_1_43_0/boost/thread/detail/platform.hpp:67:9: error: #error "Sorry, no boost threads are available for this platform." In file included from ../boost_1_43_0/boost/thread.hpp:13, from test.cpp:37: ../boost_1_43_0/boost/thread/thread.hpp:19:2: error: #error "Boost threads unavailable on this platform" The thing is, when I use the standard mpicxx from MPICH2, things work out fine. I'm now trying to find out if the problem lies in the complier, or if I simply did not compile and bootstrap boost properly. What I did when building boost is the following: ./bootstrap.sh --with-libraries=date_time,filesystem,serialization,iostreams,system,thread,mpi ./bjam cxxflags="-O2" release threading=multi link=static After bootstrap, I tried to manually edit the user-config.jam to add "using mpi ;" and explicitly added the path to the compiler, but this all did not change the above mentioned error when I try to compile my code that uses boost. Is this enough information for you to judge if I might have overlooked something when building boost? Many thanks, Chris