title: make: execvp: g++: Permission denied
body: <p>I'm trying to install <code>therubyracer</code> on Amazon Linux AMI (~centOS).</p>
  
  <pre><code>[www@ip-10-0-0-125 root]$ gem install therubyracer
  Fetching: libv8-3.16.14.3-x86_64-linux.gem (100%)
  Successfully installed libv8-3.16.14.3-x86_64-linux
  Building native extensions.  This could take a while...
  ERROR:  Error installing therubyracer:
      ERROR: Failed to build gem native extension.
  
      /home/www/.rvm/rubies/ruby-2.1.1/bin/ruby extconf.rb
  checking for main() in -lpthread... yes
  creating Makefile
  
  make "DESTDIR=" clean
  
  make "DESTDIR="
  compiling handles.cc
  make: execvp: g++: Permission denied
  make: *** [handles.o] Error 127
  
  Permission denied @ dir_chdir - /root
  
  Gem files will remain installed in /home/www/.rvm/gems/ruby-2.1.1/gems/therubyracer-0.12.1 for inspection.
  Results logged to /home/www/.rvm/gems/ruby-2.1.1/extensions/x86_64-linux/2.1.0/therubyracer-0.12.1/gem_make.out
  [www@ip-10-0-0-125 root]$
  </code></pre>
  
  <p>I am not sure what to try.. I'm installing it manually on the server with <code>gem install therubyracer</code>. I have tried doing libv8 first, many different versions and combinations of versions.</p>
  
  <p>I'm running this under the <code>www</code> user in the <code>~</code> directory.</p>
  
  <p>Thanks</p>