我无法在localhost（OS - Windows 8）上安装Unicorn。
>gem install unicorn
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.
E:/software/Ruby200-x64/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=E:/software/Ruby200-x64/bin/ruby
--with-rtlib
--without-rtlib
--with-nsllib
--without-nsllib
--with-socketlib
--without-socketlib
Gem files will remain installed in E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/kgio-2.9.2 for inspection.
Results logged to E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/kgio-2.9.2/ext/kgio/gem_make.out
为什么呢？我究竟做错了什么？我该如何解决？
我使用Ruby on Rails 4.1.4顺便说一句。
提前致谢。