无法将Rails从4.0.0升级到4.2.0

-2

我试图升级我的Mac上的导轨上的红宝石，但不知何故ERROR: Failed to build gem native extension.总是弹出。无法将Rails从4.0.0升级到4.2.0

像错误消息

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

    /usr/local/opt/ruby/bin/ruby -r ./siteconf20150422-3384-60m3u9.rb extconf.rb 
checking if the C compiler accepts ... yes 
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no 
Building nokogiri using packaged libraries. 
----- 
The file "/usr/include/iconv.h" is missing in your build environment, 
which means you haven't installed Xcode Command Line Tools properly. 

To install Command Line Tools, try running `xcode-select --install` on 
terminal and follow the instructions. If it fails, open Xcode.app, 
select from the menu "Xcode" - "Open Developer Tool" - "More Developer 
Tools" to open the developer site, download the installer for your OS 
version and run it. 
----- 
*** 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 
    --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/Cellar/ruby/2.2.2/bin/$(RUBY_BASE_NAME) 
    --help 
    --clean 
    --use-system-libraries 
    --enable-static 
    --disable-static 
    --with-zlib-dir 
    --without-zlib-dir 
    --with-zlib-include 
    --without-zlib-include=${zlib-dir}/include 
    --with-zlib-lib 
    --without-zlib-lib=${zlib-dir}/lib 
    --enable-cross-build 
    --disable-cross-build 

extconf failed, exit code 1 

Gem files will remain installed in /usr/local/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2 for inspection. 
Results logged to /usr/local/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-14/2.2.0/nokogiri-1.6.6.2/gem_make.out

来源

2015-04-22 firefly

你是在读的指令？看起来不像。有人花时间写这个解释，告诉你如何解决它。 – tadman

尝试安装的Xcode说

xcode-select --install

来源

2015-04-22 22:49:50

无法将Rails从4.0.0升级到4.2.0

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