Hello, I try to build Boost with MPI on a system and I get errors, because Boost try to build python also. I run b2 and I build with the --with option the following libraries Performing configuration checks - gcc visibility : yes - long double support : yes - has_icu builds : no Component configuration: - chrono : not building - context : not building - date_time : building - exception : building - filesystem : building - graph : not building - graph_parallel : not building - iostreams : building - locale : not building - math : building - mpi : building - program_options : building - python : not building - random : building - regex : building - serialization : building - signals : not building - system : building - test : not building - thread : building - timer : not building - wave : not building The b2 command is: --with-exception --with-math --with-system --with-iostreams --layout=system link=shared runtime-link=shared threading=multi variant=release install --prefix=../build_release/boost/1.52.0 --with-regex --with-random --with-thread --with-date_time --with-program_options --with-filesystem --with-mpi --with-serialization The build process breaks with the error eg: ...failed gcc.compile.c++ bin.v2/libs/python/build/gcc-4.6/release/threading-multi/long.o... gcc.compile.c++ bin.v2/libs/python/build/gcc-4.6/release/threading-multi/dict.o In file included from ./boost/python/detail/prefix.hpp:13:0, from ./boost/python/dict.hpp:8, from libs/python/src/dict.cpp:4: ./boost/python/detail/wrap_python.hpp:75:24: fatal error: patchlevel.h: No such file or directory compilation terminated. If I mix --with and --without option on the b2 command I get the error: error: both --with-<library> and --without-<library> specified How can I disable any Python builds? Thanks Phil