系统：
对于Rails应用程序，其中包括与原生扩展上sassc 2.0.0依赖运行bundle install得到一个编译错误。
Installing sassc 2.0.0 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory: ~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/sassc-2.0.0/ext
~/.rvm/rubies/ruby-2.5.3/bin/ruby -rrubygems ~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/rake-12.3.2/exe/rake
RUBYARCHDIR=~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/extensions/x86_64-darwin-17/2.5.0/sassc-2.0.0
RUBYLIBDIR=~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/extensions/x86_64-darwin-17/2.5.0/sassc-2.0.0
cd libsass
make lib/libsass.so
mkdir lib
/usr/bin/clang -Wall -O2 -I ~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/sassc-2.0.0/ext/libsass/include -stdlib=libc++ -fPIC -fPIC -c -o src/cencode.o src/cencode.c
src/cencode.c:50:5: warning: declaration does not declare anything [-Wmissing-declarations]
__attribute__ ((fallthrough));
^
src/cencode.c:64:5: warning: declaration does not declare anything [-Wmissing-declarations]
__attribute__ ((fallthrough));
^
2 warnings generated.
c++ -Wall -O2 -std=c++0x -I ~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/sassc-2.0.0/ext/libsass/include -stdlib=libc++ -fPIC -fPIC -c -o src/ast.o src/ast.cpp
c++: warning: couldn't understand kern.osversion '17.7.0
c++: error: unrecognized command line option '-stdlib=libc++'
make: *** [src/ast.o] Error 1
rake aborted!
Command failed with status (2): [make lib/libsass.so...]
~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/sassc-2.0.0/lib/tasks/libsass.rb:31:in `block (2 levels) in <top (required)>'
~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/sassc-2.0.0/lib/tasks/libsass.rb:13:in `block (3 levels) in <top (required)>'
~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/sassc-2.0.0/lib/tasks/libsass.rb:12:in `block (2 levels) in <top (required)>'
~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/rake-12.3.2/exe/rake:27:in `<main>'
Tasks: TOP => lib/libsass.so
(See full trace by running task with --trace)
rake failed, exit code 1
Gem files will remain installed in ~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/gems/sassc-2.0.0 for inspection.
Results logged to ~/.rvm/gems/ruby-2.5.3@hyrax-app-on-wings-2019-02-01-SDC/extensions/x86_64-darwin-17/2.5.0/sassc-2.0.0/gem_make.out
An error occurred while installing sassc (2.0.0), and Bundler cannot continue.
Make sure that `gem install sassc -v '2.0.0' --source 'https://rubygems.org/'` succeeds before bundling.
研究如何解决
尝试 - 基于在github上sassc建议
最终，这一建议编译从捆绑分离和解决再次试图捆绑之前的任何编译错误。继在最后REF（建设 - 上 - 达尔文）的指示，我能够直接建立，但使用捆绑仍然得到同样的编译器错误。
参考文献：
需要更新的gcc。我尝试使用自制软件更新和/usr/local得到许可的错误。
解：
$ sudo chown -R $(whoami) $(brew --prefix)/*
$ brew upgrade gcc
$ bundle install