gem install sasscを成功させたい

Question

前提・実現したいこと

gem 'sorcery'
gem 'haml-rails'
gem 'bootstrap-sass'

をbundle installしたい

発生している問題・エラーメッセージ

gem fileに上記gemを記載後$bundle installを実行したところ

An error occurred while installing sassc (2.3.0), and Bundler cannot
continue.
Make sure that `gem install sassc -v '2.3.0' --source 'https://rubygems.org/'`
succeeds before bundling.

と出てきたため、
$gem install sassc -v '2.3.0' --source 'https://rubygems.org/'
を実行しました。
その結果、さらに

cc1plus: error: unrecognized command line option "-std=c++11"

と出てきたため

[root@localhost ~]#yum install centos-release-scl-rh 
#yum install devtoolset-8  
#scl enable devtoolset-8 bash

を実行し、その後gem install sassc -v '2.3.0' --source 'https://rubygems.org/'
を実行したのですが、yum install前と同じエラーが出てしまいました。

抽象度高くなってしまい、大変恐縮ですが、解決策を教えていただきたいです。

該当のソースコード

[vagrant@localhost tsubuyaki]$  bundle install
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/............
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Using rake 13.0.1
Using concurrent-ruby 1.1.6
Using i18n 1.8.2
Using minitest 5.14.1
Using thread_safe 0.3.6
Using tzinfo 1.2.7
Using zeitwerk 2.3.0
Using activesupport 6.0.3.1
Using builder 3.2.4
Using erubi 1.9.0
Using mini_portile2 2.4.0
Using nokogiri 1.10.9
Using rails-dom-testing 2.0.3
Using crass 1.0.6
Using loofah 2.5.0
Using rails-html-sanitizer 1.3.0
Using actionview 6.0.3.1
Using rack 2.2.2
Using rack-test 1.1.0
Using actionpack 6.0.3.1
Using nio4r 2.5.2
Using websocket-extensions 0.1.4
Using websocket-driver 0.7.2
Using actioncable 6.0.3.1
Using globalid 0.4.2
Using activejob 6.0.3.1
Using activemodel 6.0.3.1
Using activerecord 6.0.3.1
Using mimemagic 0.3.5
Using marcel 0.3.3
Using activestorage 6.0.3.1
Using mini_mime 1.0.2
Using mail 2.7.1
Using actionmailbox 6.0.3.1
Using actionmailer 6.0.3.1
Using actiontext 6.0.3.1
Using public_suffix 4.0.5
Using addressable 2.7.0
Using execjs 2.7.0
Using autoprefixer-rails 9.7.6
Using bcrypt 3.1.13
Using bindex 0.8.1
Using msgpack 1.3.3
Using bootsnap 1.4.6
Using ffi 1.13.0
Fetching sassc 2.3.0
Installing sassc 2.3.0 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory:
/home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/sassc-2.3.0/ext
/home/vagrant/.rbenv/versions/2.7.1/bin/ruby -I
/home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0 -r
./siteconf20200602-16094-4yyty6.rb extconf.rb
creating Makefile

current directory:
/home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/sassc-2.3.0/ext
make "DESTDIR=" clean

current directory:
/home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/sassc-2.3.0/ext
make "DESTDIR="
compiling ./libsass/src/ast.cpp
cc1plus: error: unrecognized command line option "-std=c++11"
make: *** [ast.o] エラー 1

make failed, exit code 2

Gem files will remain installed in
/home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/sassc-2.3.0 for
inspection.
Results logged to
/home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/extensions/x86_64-linux/2.7.0/sassc-2.3.0/gem_make.out

An error occurred while installing sassc (2.3.0), and Bundler cannot
continue.
Make sure that `gem install sassc -v '2.3.0' --source 'https://rubygems.org/'`
succeeds before bundling.

In Gemfile:
  bootstrap-sass was resolved to 3.4.1, which depends on
    sassc

$gem install sassc -v '2.3.0' --source 'https://rubygems.org/ 実行後

[vagrant@localhost tsubuyaki]$ gem install sassc -v '2.3.0' --source 'https://rubygems.org/'
Building native extensions. This could take a while...
ERROR:  Error installing sassc:
	ERROR: Failed to build gem native extension.

    current directory: /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/sassc-2.3.0/ext
/home/vagrant/.rbenv/versions/2.7.1/bin/ruby -I /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0 -r ./siteconf20200602-16203-ytjig2.rb extconf.rb
creating Makefile

current directory: /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/sassc-2.3.0/ext
make "DESTDIR=" clean

current directory: /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/sassc-2.3.0/ext
make "DESTDIR="
compiling ./libsass/src/ast.cpp
cc1plus: error: unrecognized command line option "-std=c++11"
make: *** [ast.o] エラー 1

make failed, exit code 2

Gem files will remain installed in /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/sassc-2.3.0 for inspection.
Results logged to /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/extensions/x86_64-linux/2.7.0/sassc-2.3.0/gem_make.out

試したこと

#yum update

[root@localhost ~]#yum install centos-release-scl-rh 
#yum install devtoolset-8  
#scl enable devtoolset-8 bash

補足情報（FW/ツールのバージョンなど）

CentOS：6.10 (Final)

ここにより詳細な情報を記載してください。

Comments

[otn]

scl enable devtoolset-8 bash
で起動したbashの中でgem installしていますか？

[asm]

OSはCentosのようですが、どのバージョンをご利用ですか？

[yuto96]

CentOSのバージョンは6.10でした。

[yuto96]

＞scl enable devtoolset-8 bashで起動したbashの中でgem installしていますか？
していないです。exitしてから行っています。

[otn]

それでは駄目です。
中で実行しないと無意味。

[Mashiro]

gcc -dumpversion でgccのバージョンを確認できますか？