ruby - Rails will not install on my Mac -

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whenever attempt install rails on mac works fine after when attempt see version of rails have, terminal says not have rails installed.

here's see in terminal:

admins-mbp-5:~ programming$ sudo gem install rails building native extensions.  take while... error:  error installing rails:     error: failed build gem native extension.      /system/library/frameworks/ruby.framework/versions/2.0/usr/bin/ruby extconf.rb checking if c compiler accepts ... yes checking if c compiler accepts -wno-error=unused-command-line-argument-hard-error-in-future... no building nokogiri using packaged libraries. ----- file "/usr/include/iconv.h" missing in build environment, means haven't installed xcode command line tools properly.  install command line tools, try running `xcode-select --install` on terminal , follow instructions.  if fails, open xcode.app, select menu "xcode" - "open developer tool" - "more developer tools" open developer site, download installer os version , run it. ----- *** extconf.rb failed *** not create makefile due reason, lack of necessary libraries and/or headers.  check mkmf.log file more details.  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=/system/library/frameworks/ruby.framework/versions/2.0/usr/bin/ruby     --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   gem files remain installed in /library/ruby/gems/2.0.0/gems/nokogiri-1.6.6.2 inspection. results logged /library/ruby/gems/2.0.0/gems/nokogiri-1.6.6.2/ext/nokogiri/gem_make.out admins-mbp-5:~ programming$ rails --version rails not installed on system. latest version, type:      $ sudo gem install rails  can rerun "rails" command. 

the file "/usr/include/iconv.h" missing in build environment, means haven't installed xcode command line tools properly.

these lines tell haven't install xcode, it's necessary many console utilities.

also, install gems sudo - can cause several problems privileges later. recommend use rvm manage ruby installations, save lot of problems in future.


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