gem install kgio ERROR - ruby-on-rails

Question

I've downloaded a rails open source webapp , and while i was starting it using :
C:\Users\admin\Downloads\iCare\icare-develop>rails server
←[31mCould not find kgio-2.8.0 in any of the sources←[0m
←[33mRun `bundle install` to install missing gems.←[0m
i tried to fix this error using:
cmd:>gem install kgio -v '2.8.0'
i got the error:
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing kgio:
ERROR: Failed to build gem native extension.C:/Ruby193/bin/ruby.exe extconf.rb
checking for CLOCK_MONOTONIC in time.h... no
checking for CLOCK_MONOTONIC() in time.h... no
checking for clockid_t in time.h... no
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.
and
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:/Ruby193/bin/ruby
--with-rtlib
--without-rtlib
--with-nsllib
--without-nsllib
--with-socketlib
--without-socketlib
and
Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/kgio-2.8.
0 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/kgio-2.8.0/ext/kgio/gem_ma
ke.out
i did type:bundle install after, but nothing happened..

Answer 1

kgio is only for *nix system.
the kgio gem page:
kgio 2.8.0 kgio provides non-blocking I/O methods for Ruby without
raising exceptions on EAGAIN and EINPROGRESS. It is intended for use
with the Unicorn and Rainbows! Rack servers, but may be used by other
applications (that run on Unix-like platforms).

Answer 2

Try this
platforms :ruby do # linux
gem 'unicorn'
end
platforms :mswin do
# gems specific to windows
end
Source:
Develop on windows, run unicorn in production on heroku

Answer 3

I think you're using windows operating system , so only thing you need to get ride of this error is to comment in or remove the gem 'unicorn' in you gem file as this is only for linux systems