我正在尝试在我的 Windows 机器上安装 starling gem。但是，每当我尝试安装它时，我都会收到此错误：
Building native extensions. This could take a while...
ERROR: Error installing starling:
ERROR: Failed to build gem native extension.
c:/ruby/bin/ruby.exe extconf.rb install starling -- --srcdir= c:\ruby-1.8.7-p72
checking for windows.h... no
*** 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
--srcdir=.
--curdir
--ruby=c:/ruby/bin/ruby
Gem files will remain installed in c:/ruby/lib/ruby/gems/1.8/gems/eventmachine-0
.12.2 for inspection.
Results logged to c:/ruby/lib/ruby/gems/1.8/gems/eventmachine-0.12.2/ext/gem_mak
e.out
我需要安装什么来提供windows.h标题？