为什么安装Ruby on Rails会产生错误"数组大小'ruby_check_sizeof_voidp'为负"？

Question

安装Ruby on Rails(via gem install rails)时,您可能会收到以下错误消息:

c:/Ruby193/include/ruby-1.9.1/ruby/ruby.h:109:14: error: size of array 'ruby_check_sizeof_voidp' is negative

还会有很多这样的警告:

c:/Ruby193/include/ruby-1.9.1/ruby/ruby.h:1333:12: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

还有一个错误

c:/Ruby193/include/ruby-1.9.1/ruby/missing.h:41:8: error: redefinition of 'struct timespec'

为什么会发生这种情况？如何成功安装Rails？

Answer 1

当您为您的Ruby版本安装了错误版本的DevKit时会发生这种情况,例如,如果您安装DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe到Ruby版本1.9.3中.

要解决此问题,请重新安装Ruby并为您的Ruby版本安装正确的DevKit,如标题为"哪个开发工具包？"部分所示.在http://rubyinstaller.org/downloads.