I built Boost_1_59_0_b1_rc1 with no apparent errors.  Here are the specifics:

Windows 7.1, 64-bit, fully patched; MinGW 5.1.0 64-bit.
Time to build: 2:59:00 (I was browsing while waiting)
Build command line: \bin\b2.exe --prefix=d:\boost_1_59_0_b1 --build-type=complete --without-mpi cxxflags="-std=c++11" -a toolset=gcc  stage >d:\bin\build.log 2>&1

Highlights of build log:

Performing configuration checks

    - 32-bit                   : no
    - 64-bit                   : yes
    - arm                      : no
    - mips1                    : no
    - power                    : no
    - sparc                    : no
    - x86                      : yes
    - has_icu builds           : no
warning: Graph library does not contain MPI-based parallel components.
note: to enable them, add "using mpi ;" to your user-config.jam
    - zlib                     : yes
    - iconv (libc)             : no
    - iconv (separate)         : yes
    - icu                      : no
    - icu (lib64)              : no
    - g++ -shared-* supported  : no
    - compiler-supports-visibility : yes
    - message-compiler         : no
    - compiler-supports-ssse3  : yes
    - compiler-supports-avx2   : yes
    - gcc visibility           : yes
    - long double support      : yes
. . .

Component configuration:

    - atomic                   : building
    - chrono                   : building
    - container                : building
    - context                  : building
    - coroutine                : building
    - date_time                : building
    - exception                : building
    - filesystem               : building
    - graph                    : building
    - graph_parallel           : building
    - iostreams                : building
    - locale                   : building
    - log                      : building
    - math                     : building
    - mpi                      : not building
    - program_options          : building
    - python                   : building
    - random                   : building
    - regex                    : building
    - serialization            : building
    - signals                  : building
    - system                   : building
    - test                     : building
    - thread                   : building
    - timer                    : building
    - wave                     : building

...patience...
...patience...
...patience...
...patience...
...patience...
...found 16476 targets...
...updating 5881 targets...

<all that other log stuff>

...failed updating 340 targets...
...skipped 104 targets...
...updated 5437 targets...

My project compiled and linked as normal.

Merrill Cornish