Rails：无法运行应用程序，因为“安装json（1.7.7）时发生错误”

今天我运行了一个应用程序，我一直在半年前工作，并且当我运行命令软件包更新，我得到这个错误：Rails：无法运行应用程序，因为“安装json（1.7.7）时发生错误”

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. 

     /Users/adam/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb 
creating Makefile 

make 
/usr/bin/gcc-4.2 -I. -I/Users/adam/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/x86_64-darwin10.8.0 -I/Users/adam/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward -I/Users/adam/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1 -I. -DJSON_GENERATOR -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -fno-common -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long -fno-common -pipe -O3 -Wall -O0 -ggdb -o generator.o -c generator.c 
make: /usr/bin/gcc-4.2: No such file or directory 
make: *** [generator.o] Error 1 


Gem files will remain installed in /Users/adam/.rvm/gems/ruby-1.9.2-p290/gems/json-1.7.7 for inspection. 
Results logged to /Users/adam/.rvm/gems/ruby-1.9.2-p290/gems/json-1.7.7/ext/json/ext/generator/gem_make.out 
An error occured while installing json (1.7.7), and Bundler cannot continue. 
Make sure that `gem install json -v '1.7.7'` succeeds before bundling.

下面是相关的部分从Gemfile中：

gem "eventmachine", "~> 1.0.0" 
gem "json", "~> 1.7.7"

我在Lion上OS X上运行，我发现可能有助于更新命令行工具，但我只是更新了它最新版本，但仍然出现此错误。

请问你能帮助我，怎样摆脱这个错误？

谢谢

编辑：gem install json -v '1.7.7'回报：

Building native extensions. This could take a while... 
ERROR: Error installing json: 
    ERROR: Failed to build gem native extension. 

     /Users/adam/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb 
creating Makefile 

make 
/usr/bin/gcc-4.2 -I. -I/Users/adam/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/x86_64-darwin10.8.0 -I/Users/adam/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward -I/Users/adam/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1 -I. -DJSON_GENERATOR -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -fno-common -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long -fno-common -pipe -O3 -Wall -O0 -ggdb -o generator.o -c generator.c 
make: /usr/bin/gcc-4.2: No such file or directory 
make: *** [generator.o] Error 1 


Gem files will remain installed in /Users/adam/.rvm/gems/ruby-1.9.2-p290/gems/json-1.7.7 for inspection. 
Results logged to /Users/adam/.rvm/gems/ruby-1.9.2-p290/gems/json-1.7.7/ext/json/ext/generator/gem_make.out

来源

2013-02-12 user984621

什么“gem install json -v'1.7.7'”返回？ – 2013-02-12 01:13:54

试试'ln -s/usr/bin/gcc/usr/bin/gcc-4.2'然后重新安装？ – hd1 2013-02-12 01:15:31

@MichaelDurrant - 请检查出更新的OP，我添加了声明。 – user984621 2013-02-12 01:19:47

对于Xcode的4.x版：

sudo ln -s /usr/bin/llvm-gcc-4.2 /usr/bin/gcc-4.2

对于Xcode的5.x的：

export CC=gcc

来源

2013-09-26 23:33:48 zethus

Rails：无法运行应用程序，因为“安装json（1.7.7）时发生错误”

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