Install SciRuby failed on OS X - ruby

Question

I have gcc6.1 installed on OS X via brew, when I tried to install sciruby-full on my Mac, always got this Error:
>Fetching: nmatrix-0.1.0.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing sciruby-full:
ERROR: Failed to build gem native extension.
/usr/local/opt/ruby/bin/ruby -r ./siteconf20150627-98945-1pk3go6.rb extconf.rb
checking for apparent GNU g++ binary with C++0x/C++11 support... Exception `RuntimeError' at extconf.rb:144 - You need a version of g++ which supports -std=c++0x or -std=c++11. If you're on a Mac and using Homebrew, we recommend using mac-brew-gcc.sh to install a more recent g++.
*** 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
--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=/usr/local/Cellar/ruby/2.2.2/bin/$(RUBY_BASE_NAME)
extconf.rb:144:in `<main>': You need a version of g++ which supports -std=c++0x or -std=c++11. If you're on a Mac and using Homebrew, we recommend using mac-brew-gcc.sh to install a more recent g++. (RuntimeError)
extconf failed, exit code 1
Gem files will remain installed in /usr/local/lib/ruby/gems/2.2.0/gems/nmatrix-0.1.0 for inspection.
Results logged to /usr/local/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-14/2.2.0/nmatrix-0.1.0/gem_make.out
My ruby and OS X is always the newest: Ruby 2.2.2 on updated Yosemite.

Answer 1

From your error message:
extconf.rb:144:in `': You need a version of g++ which supports
-std=c++0x or -std=c++11. If you're on a Mac and using Homebrew, we recommend using mac-brew-gcc.sh to install a more recent g++.
(RuntimeError)

Answer 2

Do the following (using homebrew)
brew tap homebrew/versions
brew install gcc48
if this does not work, try gcc47 or gcc46.
Note: It make take a while to build. gcc is quite large.