Hi, For my project I saw today that I needed MPI too. So I installed MPICH2 and Changed my < user-config.jam > file like that : import toolset : using ; using python : 2.7 : "C:/Python273" : "C:/Python273/include" : "C:/Python273/libs" ; using mpi : : <find-static-library>mpi <library-path>"C:/librairies/MPICH2-3.0.2/lib" <include>"C:/librairies/MPICH2-3.0.2/include" : "\"C:\\librairies\\MPICH2-3.0.2\\bin\\mpiexec\"" ; So I compile Boost with this command line : b2 toolset=gcc --j4 --layout=system release --prefix=C:\librairies\boost-1.53.0 --user-config=user-config.jam install And the error is in the out.txt file in attachment. Anyone know what's happenned ? Thanks in advance. Julien.