PS C:\Ruby22-x64\devkit> gem install rails Temporarily enhancing PATH to include DevKit... Building native extensions. This could take a while... ERROR: Error installing rails: ERROR: Failed to build gem native extension. current directory: C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/nio4r-2.1.0/ext/nio4r C:/Ruby22-x64/bin/ruby.exe -r ./siteconf20170920-23484-1r7gyhb.rb extconf.rb checking for unistd.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:/Ruby22-x64/bin/$(RUBY_BASE_NAME) C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. You have to install development tools first. from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:587:in `try_cpp' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:1060:in `block in have_header' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:911:in `block in checking_for' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:351:in `block (2 levels) in postpone' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:321:in `open' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:351:in `block in postpone' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:321:in `open' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:347:in `postpone' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:910:in `checking_for' from C:/Ruby22-x64/lib/ruby/2.2.0/mkmf.rb:1059:in `have_header' from extconf.rb:5:in `<main>' To see why this extension failed to compile, please check the mkmf.log which can be found here: C:/Ruby22-x64/lib/ruby/gems/2.2.0/extensions/x64-mingw32/2.2.0/nio4r-2.1.0/mkmf.log extconf failed, exit code 1 Gem files will remain installed in C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/nio4r-2.1.0 for inspection. Results logged to C:/Ruby22-x64/lib/ruby/gems/2.2.0/extensions/x64-mingw32/2.2.0/nio4r-2.1.0/gem_make.out
gem install railsをしたらこうなりました。
どうしたらrails をインストールできますか?
Rubyinstaller の2.2.6の64bitをインストールし、64ビット版のdevkitをインストールしました。そして、gem install rails。
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