在Windows上安装RubyInstaller和DevKit后，无法安装rdiscount gem

Question

我尝试在我的Windows7机器上设置RoR时遇到一些错误。我在RubyInstaller和DevKit上安装了Ruby。在他们的指令中，它说要执行gem install rdiscount --platform=ruby以确保它被正确安装。我得到以下错误：

C:\Windows\system32>cd ../../DevKit

C:\DevKit>gem install rdiscount --platform=ruby
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing rdiscount:
        ERROR: Failed to build gem native extension.

    C:/Ruby200-x64/bin/ruby.exe extconf.rb
checking for random()... *** 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=C:/Ruby200-x64/bin/ruby
        --with-rdiscount-dir
        --without-rdiscount-dir
        --with-rdiscount-include
        --without-rdiscount-include=${rdiscount-dir}/include
        --with-rdiscount-lib
        --without-rdiscount-lib=${rdiscount-dir}/
C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:431:in `try_do': The compiler failed to ge
nerate an executable file. (RuntimeError)
You have to install development tools first.
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:516:in `try_link0'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:531:in `try_link'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:717:in `try_func'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:1001:in `block in have_func'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:892:in `block in checking_for
'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:337:in `block (2 levels) in p
ostpone'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:307:in `open'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:337:in `block in postpone'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:307:in `open'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:333:in `postpone'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:891:in `checking_for'
        from C:/Ruby200-x64/lib/ruby/2.0.0/mkmf.rb:1000:in `have_func'
        from extconf.rb:5:in `<main>'


Gem files will remain installed in C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rdisc
ount-2.0.7.1 for inspection.
Results logged to C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rdiscount-2.0.7.1/ext/
gem_make.out

我尝试了this suggestion，并删除了一个重复的libiconv-2.dll文件，但问题仍然存在。有什么建议吗？

Answer 1

此时，Windows上的RDiscount已损坏，请参阅issue #74 at GitHub

如果您已经安装了Ruby和DevKit，那么您可以安装其他gem，如json或RedCloth，以验证它是否能够正确编译：

gem install json --platform=ruby
gem install RedCloth --platform=ruby

希望这能有所帮助。