我在终端（OSX 10.6.6）中尝试了以下命令并最终出错 . 有谁知道如何解决这个问题？
sudo gem install json
Building native extensions. This could take a while...
ERROR: Error installing json:
ERROR: Failed to build gem native extension.
/usr/local/bin/ruby extconf.rb
checking for ruby/re.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=/usr/local/bin/ruby
/usr/local/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/local/lib/ruby/1.9.1/mkmf.rb:452:in `try_cpp'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:834:in `block in have_header'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:833:in `have_header'
from extconf.rb:17:in `'
Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/json-1.5.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/json-1.5.1/ext/json/ext/generator/gem_make.out
3 回答
您需要安装XCode . 它可以在AppStore上找到
如果安装了XCode并且您仍然收到此错误，也许您应该尝试使用rvm
您收到此错误的原因是因为json gem包含需要在机器上运行之前需要编译的C / C扩展 .
只是安装XCode无法修复它，您需要专门安装XCode命令行工具 . 它是一个编译器/链接器工具链，包括C / C编译器，make等 .
可以选择在XCode GUI内的菜单中安装它们，有关详细信息，请参阅此主题：
Xcode 4.4 and later install Command Line Tools
您应该能够通过运行来安装必要的工具：