Gem 自从卸载了 rmagick 以后就 install 不回去了...不得已来求助~
OS X EI Capitan 10.11.1。。曾经我在执行了 brew update && brew upgrade 以后我的 rails c 什么的就跑不起来了。。报了个 image 的错误，然后我就脑抽得卸载了 rmagick，bundle exec gem uninstall rmagick，并且选择了 all versions..然后就是用尽浑身解数也装不回去了。。执行 sudo gem install rmagick 一直提示
ERROR: Error installing rmagick:
ERROR: Failed to build gem native extension.
/Users/apple/.rbenv/versions/2.2.0-dev/bin/ruby -r ./siteconf20160108-2705-15xzewu.rb extconf.rb
checking for clang... yes
checking for Magick-config... yes
checking for outdated ImageMagick version (<= 6.4.9)... no
checking for Ruby version >= 1.8.5... yes
checking for stdint.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=/Users/apple/.rbenv/versions/2.2.0-dev/bin/$(RUBY_BASE_NAME)
/Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:457:in try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:588:intry_cpp'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:1091:in block in have_header'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:942:inblock in checking_for'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:351:in block (2 levels) in postpone'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:321:inopen'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:351:in block in postpone'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:321:inopen'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:347:in postpone'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:941:inchecking_for'
from /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/2.3.0/mkmf.rb:1090:in have_header'
from extconf.rb:38:inconfigure_headers'
from extconf.rb:18:in initialize'
from extconf.rb:517:innew'
from extconf.rb:517:in `'
extconf failed, exit code 1
Gem files will remain installed in /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/gems/2.3.0/gems/rmagick-2.15.4 for inspection. Results logged to /Users/apple/.rbenv/versions/2.2.0-dev/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-14/2.3.0-static/rmagick-2.15.4/gem_make.out
我重装了 brew install imagemagick，还是不能 sudo gem install rmagick 查了很多，居然大多都是在 window 上装才会出现这种错误信息。。可是我 OS X 诶。。于是就蛋疼了。。
这个到底是为毛啊。。。跪求！
我也怀疑我是不是搞了点 npm 的东西。。结果把这个 navite 搞坏了。。但是想想又不大可能吧。。
checking for outdated ImageMagick version (<= 6.4.9)... no
你的 ImageMagick 版本是啥？
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.
检查 mkmf.log
Let me google that for you
You are not alone.
http://stackoverflow.com/questions/13963404/rails-and-os-x-how-to-install-rmagick
啊啊啊啊我装起来了~~~~ 用了http://www.nokogiri.org/tutorials/installing_nokogiri.html#mac_os_xnokogiri里面的一个解决方法~~然后我的rmagick也install成功了！！这里面对于 brew unlink gcc gem uninstall nokogiri xcode-select --install gem install nokogiri gem install rmagick
checking for stdint.h... *** extconf.rb failed ***
我觉得你还是自己 cd 进目录跑一下编译看看到底是哪步崩了。 目测和 1 楼的链接说的还不太一样。
