Question

我正在尝试从新创建的Rails应用程序更新gem文件。每次我得到以下内容：

Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.1.0)
Using i18n (0.6.5)
Using minitest (4.7.5)
Using multi_json (1.8.2)
Using atomic (1.1.14)
Using thread_safe (0.1.3)
Using tzinfo (0.3.38)
Using activesupport (4.0.0)
Using builder (3.1.4)
Using erubis (2.7.0)
Using rack (1.5.2)
Using rack-test (0.6.2)
Using actionpack (4.0.0)
Using mime-types (1.25)
Using polyglot (0.3.3)
Using treetop (1.4.15)
Using mail (2.5.4)
Using actionmailer (4.0.0)
Using activemodel (4.0.0)
Using activerecord-deprecated_finders (1.0.3)
Using arel (4.0.1)
Using activerecord (4.0.0)
Using bundler (1.3.5)
Using coffee-script-source (1.6.3)
Using execjs (2.0.2)
Using coffee-script (2.2.0)
Using thor (0.18.1)
Using railties (4.0.0)
Using coffee-rails (4.0.1)
Using hike (1.2.3)
Using jbuilder (1.5.2)
Using jquery-rails (3.0.4)
Installing json (1.8.1)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /Users/adrianleeelder/.rvm/rubies/ruby-2.0.0-p0/bin/ruby extconf.rb
creating Makefile

make
compiling generator.c
make: gcc-4.2: No such file or directory
make: *** [generator.o] Error 1


Gem files will remain installed in /Users/adrianleeelder/.rvm/gems/ruby-2.0.0-p0/gems/json-1.8.1 for inspection.
Results logged to /Users/adrianleeelder/.rvm/gems/ruby-2.0.0-p0/gems/json-1.8.1/ext/json/ext/generator/gem_make.out

An error occurred while installing json (1.8.1), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.1'` succeeds before bundling.

我一直在更新到OS X Mavericks，因为我遇到了这个问题。许多用户建议运行该命令：xcode-select --install。

Answer 1

我通过执行以下操作修复了错误：

1）运行命令which gcc

2）然后根据输出调整此命令并运行它：ln -s /usr/bin/gcc /usr/bin/gcc-4.2（如果权限被拒绝，可能必须预先添加sudo）

bundle命令现在应该正确编译gems。

安装Xcode也可以。我已经安装了Xcode，但由于某些原因我最近尝试启动它时会提示安装。使用Alfred（快速启动应用程序）我输入了Xcode并启动了安装程序。

Answer 2

我使用以下内容通过自制程序修复了错误：

brew tap homebrew/versions && brew install apple-gcc42

brew link --force apple-gcc42

ln -nsf $(which gcc-4.2) /usr/bin/gcc-4.2

如果您收到权限问题，则最后一个命令可能需要'sudo'。

Gem Installer Extension Build错误

2 个答案: