安装oily_png gem 时出现错误。Ruby 已经安装在我的系统中。我在 Windows 7 - 64 位。
C:\Users\jitendra>gem install oily_png
Fetching: oily_png-1.0.2.gem (100%)
ERROR: Error installing oily_png:
The 'oily_png' native gem requires installed build tools.
Please update your PATH to include build tools or download the DevKit
from 'http://rubyinstaller.org/downloads' and follow the instructions
at 'http://github.com/oneclick/rubyinstaller/wiki/Development-Kit'