Not able to install unicorn server on my windows desktop

Could you please look into this why we are getting this error when trying to bundle the rails app to install unicorn server so that we could be able to run the app on Foreman

Error::

```

Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing unicorn:
ERROR: Failed to build gem native extension.
C:/RailsInstaller/Ruby2.0.0/bin/ruby.exe extconf.rb
checking for CLOCK_MONOTONIC in time.h... yes
checking for clockid_t in time.h... yes
checking for clock_gettime() in -lrt... no
checking for t_open() in -lnsl... no
checking for socket() in -lsocket... no
checking for poll() in poll.h... no
checking for getaddrinfo() in sys/types.h,sys/socket.h,netdb.h... no
getaddrinfo required
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=C:/RailsInstaller/Ruby2.0.0/bin/ruby
--with-rtlib
--without-rtlib
--with-nsllib
--without-nsllib
--with-socketlib
--without-socketlib
Gem files will remain installed in C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/kgio-2.9.3 for i
Results logged to C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/kgio-2.9.3/ext/kgio/gem_make.out

```