$ brew install ecell4
==> Installing ecell4 from ecell/homebrew-ecell4
==> Downloading http://dev.e-cell.org/downloads/ecell-4.0.0.zip
Already downloaded: /Library/Caches/Homebrew/ecell4-4.0.0.zip
==> cmake . -DCMAKE_INSTALL_PREFIX=/usr/local/Cellar/ecell4/4.0.0
==> make BesselTables
==> Downloading http://cython.org/release/Cython-0.23.2.zip
Already downloaded: /Library/Caches/Homebrew/ecell4--cython-0.23.2.zip
==> python -c import setuptools... --no-user-cfg install --prefix=/private/tmp/e
==> python setup.py build_ext
Last 15 lines from /Users/denis/Library/Logs/Homebrew/ecell4/04.python:
In file included from lib/ecell4/core.cpp:261:
In file included from ../ecell4/core/RandomNumberGenerator.hpp:11:
../ecell4/core/Real3.hpp:217:13: error: implicit instantiation of undefined template 'boost::hash<double>'
            hash<argument_type::value_type>()(val[2]);
            ^
/usr/local/include/boost/functional/hash/hash_fwd.hpp:23:31: note: template is declared here
    template <class T> struct hash;
                              ^
In file included from lib/ecell4/core.cpp:262:
In file included from ../ecell4/core/UnitSpecies.hpp:18:
../ecell4/core/get_mapper_mf.hpp:7:10: fatal error: 'unordered_map' file not found
#include <unordered_map>
         ^
6 errors generated.
error: command 'clang' failed with exit status 1

READ THIS: https://git.io/brew-troubleshooting
If reporting this issue please do so at (not Homebrew/homebrew):
  https://github.com/ecell/homebrew-ecell4/issues

> brew doctor                                
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!

Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected dylibs:
    /usr/local/lib/libecell4-bd.dylib
    /usr/local/lib/libecell4-core.dylib
    /usr/local/lib/libecell4-egfrd.dylib
    /usr/local/lib/libecell4-gillespie.dylib
    /usr/local/lib/libecell4-lattice.dylib
    /usr/local/lib/libecell4-meso.dylib
    /usr/local/lib/libecell4-ode.dylib

Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected header files:
    /usr/local/include/ecell4/core/config.h
    /usr/local/include/ecell4/egfrd/compat.h
    /usr/local/include/ecell4/egfrd/config.h