Question

我在安装Watir时遇到问题。我猜我错过了一些C库。这是我做的：

已安装的Rubyinstaller
已安装的devkit
gem update --system
gem install watir --platform x86-mingw32

这是我的输出：

C:\>gem install watir --platform x86-mingw32
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing watir:
    ERROR: Failed to build gem native extension.

C:/Ruby200/bin/ruby.exe extconf.rb
checking for ffi.h... *** 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/bin/ruby
    --with-ffi_c-dir
    --without-ffi_c-dir
    --with-ffi_c-include
    --without-ffi_c-include=${ffi_c-dir}/include
    --with-ffi_c-lib
    --without-ffi_c-lib=${ffi_c-dir}/
    --with-libffi-config
    --without-libffi-config
    --with-pkg-config
    --without-pkg-config
C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:430:in `try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first.
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:561:in `try_cpp'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:1040:in `block in have_header'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:891:in `block in checking_for'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:336:in `block (2 levels) in postpone'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:306:in `open'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:336:in `block in postpone'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:306:in `open'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:332:in `postpone'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:890:in `checking_for'
    from C:/Ruby200/lib/ruby/2.0.0/mkmf.rb:1039:in `have_header'
    from extconf.rb:16:in `<main>'


Gem files will remain installed in C:/Ruby200/lib/ruby/gems/2.0.0/gems/ffi-1.9.3 for inspection. Results logged to C:/Ruby200/lib/ruby/gems/2.0.0/gems/ffi-1.9.3/ext/ffi_c/gem_make.out

Answer 1

您为 MINGW 平台安装了 FFI 的标头。如果您使用 MINGW 进行 CYGWIN ，则应运行 CYGWIN 安装程序并安装 libffi-devel / libffi-dev 包裹。否则，您应该为 MINGW 安装外部开发包，例如this，以支持 ffi 的开发标题。

此外，请参阅此处有关如何在 mingw here上使用 FFI 的信息。

尝试安装watir时出错

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