错误：无法构建gem本机扩展。 JSON宝石

Question

我对Rails的世界相当陌生，想创建另一个项目来玩一些代码。在运行'rails new myproject'时，我遇到了这个错误。我搜索了Google的解决方案，但没有运气。如何在运行“捆绑安装”时通过此问题继续创建我的Rails应用程序？

我运行：
OSX 10.7.5
的Rails 3.1.1
的Ruby 1.8.7（2012-02-08 PATCHLEVEL 358）万向darwin11.0]

Using coffee-script (2.2.0) Using rack-ssl (1.3.3) Installing json (1.8.0) with native extensions Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb creating Makefile

make xcrun cc -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin11.0 -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin11.0 -I. -DJSON_GENERATOR -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -fno-common -arch i386 -arch x86_64 -g -O3 -pipe -fno-common -DENABLE_DTRACE -fno-common -pipe -fno-common -c generator.c Error: No developer directory found at /Developer. Run /usr/bin/xcode-select to update the developer directory path. make: * [generator.o] Error 1

Gem files will remain installed in /Users/me/.bundler/tmp/1673/gems/json-1.8.0 for inspection. Results logged to /Users/me/.bundler/tmp/1673/gems/json-1.8.0/ext/json/ext/generator/gem_make.out An error occured while installing json (1.8.0), and Bundler cannot continue. Make sure that gem install json -v '1.8.0' succeeds before bundling.

我注意到这条线，但不知道这意味着什么.. 错误：在/ Developer中找不到开发人员目录。运行/ usr/bin/xcode-select更新开发者目录路径。

谢谢！

Answer 1

您可能需要从偏好在Xcode 4安装“命令行工具”