Fails to build with boost 1.75 on Mac

When trying to build fmm from the Repo the process fails because of boost 1.75

/usr/local/include/boost/geometry/util/type_traits_std.hpp:54:12: error: no
      template named 'conditional_t' in namespace 'std'; did you mean
      'conditional'?
    : std::conditional_t<Trait::value, conjunction<Traits...>, Trait>
      ~~~~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:530:33: note: 
      'conditional' declared here
    struct _LIBCPP_TEMPLATE_VIS conditional {typedef _If type;};

[…]

/usr/local/include/boost/geometry/core/coordinate_dimension.hpp:101:23: error: 
      constexpr function's return type 'void' is not a literal type
constexpr inline void assert_dimension()
                      ^

[…]

fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make[2]: *** [CMakeFiles/ALGORITHM.dir/src/algorithm/geom_algorithm.cpp.o] Error 1
make[1]: *** [CMakeFiles/ALGORITHM.dir/all] Error 2
make: *** [all] Error 2

When I change the CXX_FLAGS from -std=gnu++11 to -std=gnu++14 it compiles successfully, but Python libs don't work because of 34105 segmentation fault python

cyang-kth / fmm

Fails to build with boost 1.75 on Mac #178