我试图将sass版本的font-awesome安装到我的基础项目中。当我：
$ gem install font-awesome-sass
ERROR: Error installing font-awesome-sass:
railties requires activesupport (= 4.0.2)
当我尝试从3.2.12更新activesupport时，我得到了这个：
$ gem update activesupport
Updating installed gems
Updating activesupport
Building native extensions. This could take a while...
ERROR: Error installing activesupport:
ERROR: Failed to build gem native extension.
/Users/davidpindrys/.rbenv/versions/2.0.0-rc1/bin/ruby extconf.rb
*** 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/davidpindrys/.rbenv/versions/2.0.0-rc1/bin/ruby
--with-atomic_reference-dir
--without-atomic_reference-dir
--with-atomic_reference-include
--without-atomic_reference-include=${atomic_reference-dir}/include
--with-atomic_reference-lib
--without-atomic_reference-lib=${atomic_reference-dir}/
/Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/2.0.0/mkmf.rb:410:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/2.0.0/mkmf.rb:495:in `try_link0'
from /Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/2.0.0/mkmf.rb:784:in `try_run'
from extconf.rb:26:in `<main>'
Gem files will remain installed in /Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/gems/2.0.0/gems/atomic-1.1.14 for inspection.
Results logged to /Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/gems/2.0.0/gems/atomic-1.1.14/ext/gem_make.out
Nothing to update
我不确定我应该尝试安装什么依赖项，并且不想加载任何可能过量的项目，因为它之前的工作非常完美。感谢您的帮助:)）
按照建议，我尝试了$ gem install activesupport，并返回了：
$ gem install activesupport '4.0.2'
Building native extensions. This could take a while...
ERROR: Error installing activesupport:
ERROR: Failed to build gem native extension.
/Users/davidpindrys/.rbenv/versions/2.0.0-rc1/bin/ruby extconf.rb
*** 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/davidpindrys/.rbenv/versions/2.0.0-rc1/bin/ruby
--with-atomic_reference-dir
--without-atomic_reference-dir
--with-atomic_reference-include
--without-atomic_reference-include=${atomic_reference-dir}/include
--with-atomic_reference-lib
--without-atomic_reference-lib=${atomic_reference-dir}/
/Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/2.0.0/mkmf.rb:410:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/2.0.0/mkmf.rb:495:in `try_link0'
from /Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/2.0.0/mkmf.rb:784:in `try_run'
from extconf.rb:26:in `<main>'
Gem files will remain installed in /Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/gems/2.0.0/gems/atomic-1.1.14 for inspection.
Results logged to /Users/davidpindrys/.rbenv/versions/2.0.0-rc1/lib/ruby/gems/2.0.0/gems/atomic-1.1.14/ext/gem_make.out
ERROR: Could not find a valid gem '4.0.2' (>= 0) in any repository