Ran into a problem installing 'landrush' with vagrant

OSX 10.11.6

Error with installing a dependency eventmachine (1.0.9.1)

Sample Error:

$ vagrant plugin install landrush
Installing the 'landrush' plugin. This can take a few minutes...
Bundler, the underlying system Vagrant uses to install plugins,
reported an error. The error is shown below. These errors are usually
caused by misconfigured plugin installations or transient network
issues. The error from Bundler is:

An error occurred while installing eventmachine (1.0.9.1), and Bundler cannot continue.
Make sure that `gem install eventmachine -v '1.0.9.1'` succeeds before bundling.

...
..skipping...
/opt/vagrant/embedded/bin/ruby -r ./siteconf20160924-85278-6sy73w.rb extconf.rb
checking for main() in -lcrypto... yes
checking for main() in -lssl... yes
checking for openssl/ssl.h... no
checking for main() in -lcrypto... yes
checking for main() in -lssl... yes
checking for openssl/ssl.h... no
checking for main() in -lcrypto... yes
checking for main() in -lssl... yes
checking for openssl/ssl.h... no
checking for main() in -lcrypto... yes
checking for main() in -lssl... yes
checking for openssl/ssl.h... yes
checking for openssl/err.h... yes
-----
Found OpenSSL in path /usr/local/opt/openssl
-----
checking for rb_trap_immediate in ruby.h,rubysig.h... no
checking for rb_thread_blocking_region()... no
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... no
/opt/vagrant/embedded/include/ruby-2.2.0/ruby/intern.h:454:42: note: passing argument to parameter here
int rb_thread_fd_select(int, rb_fdset_t *, rb_fdset_t *, rb_fdset_t *, struct timeval *);
                                         ^
em.cpp:941:9: error: use of undeclared identifier 'rb_thread_select'; did you mean 'rb_thread_fd_select'?
        return EmSelect (maxsocket+1, &fdreads, &fdwrites, &fderrors, &tv);
               ^~~~~~~~
               rb_thread_fd_select
./em.h:29:22: note: expanded from macro 'EmSelect'
    #define EmSelect rb_thread_select
                     ^
/opt/vagrant/embedded/include/ruby-2.2.0/ruby/intern.h:454:5: note: 'rb_thread_fd_select' declared here
int rb_thread_fd_select(int, rb_fdset_t *, rb_fdset_t *, rb_fdset_t *, struct timeval *);
    ^
em.cpp:1065:6: error: use of undeclared identifier 'rb_thread_select'; did you mean 'rb_thread_fd_select'?
                                        EmSelect (0, NULL, NULL, NULL, &tv);
                                        ^~~~~~~~
                                        rb_thread_fd_select
./em.h:29:22: note: expanded from macro 'EmSelect'
    #define EmSelect rb_thread_select
                     ^
/opt/vagrant/embedded/include/ruby-2.2.0/ruby/intern.h:454:5: note: 'rb_thread_fd_select' declared here
int rb_thread_fd_select(int, rb_fdset_t *, rb_fdset_t *, rb_fdset_t *, struct timeval *);
    ^
4 errors generated.
make: *** [em.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/jmatthews/.vagrant.d/gems/gems/eventmachine-1.0.9.1 for inspection.
Results logged to /Users/jmatthews/.vagrant.d/gems/extensions/universal-darwin-12/2.2.0/eventmachine-1.0.9.1/gem_make.out

Found a workaround here

https://github.com/eventmachine/eventmachine/issues/553#issuecomment-218450602

$ brew install openssl
Warning: openssl-1.0.2g already installed

$ brew link openssl --force
Linking /usr/local/Cellar/openssl/1.0.2g... 1588 symlinks created

$ vagrant plugin install landrush
Installing the 'landrush' plugin. This can take a few minutes...
Installed the plugin 'landrush (1.1.2)'!