Rails無法在Sierra上安裝

Question

（非常感謝您的回答！有效）

我正在嘗試在macOS 10.12（Sierra）上安裝Rails。 我正在使用Terminal通過以下命令進行安裝：

$ sudo gem install rails

這將產生以下輸出：

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

    current directory: /Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/nokogiri-1.7.0.1/ext/nokogiri
/Users/paullantow/.rbenv/versions/2.2.3/bin/ruby -r ./siteconf20170111-22393-xqzt1j.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.
Using mini_portile version 2.1.0
checking for iconv.h... yes
checking for gzdopen() in -lz... yes
checking for iconv... yes
************************************************************************
IMPORTANT NOTICE:

Building Nokogiri with a packaged version of libxml2-2.9.4.

Team Nokogiri will keep on doing their best to provide security
updates in a timely manner, but if this is a concern for you and want
to use the system library instead; abort this installation process and
reinstall nokogiri as follows:

    gem install nokogiri -- --use-system-libraries
        [--with-xml2-config=/path/to/xml2-config]
        [--with-xslt-config=/path/to/xslt-config]

If you are using Bundler, tell it to use the option:

    bundle config build.nokogiri --use-system-libraries
    bundle install

Note, however, that nokogiri is not fully compatible with arbitrary
versions of libxml2 provided by OS/package vendors.
************************************************************************
Extracting libxml2-2.9.4.tar.gz into tmp/x86_64-apple-darwin16.3.0/ports/libxml2/2.9.4... OK
Running 'configure' for libxml2 2.9.4... OK
Running 'compile' for libxml2 2.9.4... ERROR, review '/Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/nokogiri-1.7.0.1/ext/nokogiri/tmp/x86_64-apple-darwin16.3.0/ports/libxml2/2.9.4/compile.log' to see what happened. Last lines are:
========================================================================
    unsigned short* in = (unsigned short*) inb;
                         ^~~~~~~~~~~~~~~~~~~~~
encoding.c:815:27: warning: cast from 'unsigned char *' to 'unsigned short *' increases required alignment from 1 to 2 [-Wcast-align]
    unsigned short* out = (unsigned short*) outb;
                          ^~~~~~~~~~~~~~~~~~~~~~
4 warnings generated.
  CC       error.lo
  CC       parserInternals.lo
  CC       parser.lo
  CC       tree.lo
  CC       hash.lo
  CC       list.lo
  CC       xmlIO.lo
xmlIO.c:1450:52: error: use of undeclared identifier 'LZMA_OK'
    ret =  (__libxml2_xzclose((xzFile) context) == LZMA_OK ) ? 0 : -1;
                                                   ^
1 error generated.
make[2]: *** [xmlIO.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
========================================================================
*** 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/paullantow/.rbenv/versions/2.2.3/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
/Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:366:in `block in execute': Failed to complete compile task (RuntimeError)
    from /Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:337:in `chdir'
    from /Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:337:in `execute'
    from /Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:111:in `compile'
    from /Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:150:in `cook'
    from extconf.rb:364:in `block (2 levels) in process_recipe'
    from extconf.rb:257:in `block in chdir_for_build'
    from extconf.rb:256:in `chdir'
    from extconf.rb:256:in `chdir_for_build'
    from extconf.rb:363:in `block in process_recipe'
    from extconf.rb:262:in `tap'
    from extconf.rb:262:in `process_recipe'
    from extconf.rb:547:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-16/2.2.0-static/nokogiri-1.7.0.1/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/nokogiri-1.7.0.1 for inspection.
Results logged to /Users/paullantow/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-16/2.2.0-static/nokogiri-1.7.0.1/gem_make.out

我已經安裝了XCode命令行工具（8.21），這是我在搜索有此問題的其他人時看到的常見原因。

我使用RVM安裝了多個版本的Ruby。

我還卸載並重新安裝了自制軟件。

對於在系統上啟動和運行Rails的任何建議，我將不勝感激。

Answer 1

嘗試使用

gem install nokogiri -v 1.7.0.1 -- --use-system-libraries=true --with-xml2-include=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/include/libxml2

Answer 2

嘗試：

寶石更新-系統

然后：

xcode-select-安裝

然后：

寶石安裝nokogiri

最后：

安裝導軌寶石