BOOST_LIB_RT_OPT:     A suffix that indicates the runtime library used,
                      contains one or more of the following letters after
                      a hyphen:

                      s      static runtime (dynamic if not present).
                      g      debug/diagnostic runtime (release if not present).
                      y      Python debug/diagnostic runtime (release if not present).
                      d      debug build (release if not present).
                      p      STLport build.
                      n      STLport build without its IOStreams.