old_contents: {
    'targets': [
      {
        'target_name': 'bufferutil',
        'include_dirs': ["<!(node -e \"require('nan')\")"],
        'cflags': [ '-O3' ],
        'sources': [ 'src/bufferutil.cc' ]
      }
    ]
  }
  
new_contents: {
    'targets': [
      {
        'target_name': 'bufferutil',
        'include_dirs': ["<!(node -e \"require('nan')\")"],
        'cflags!': [ '-O3' ],
        'cflags': [ '-O2' ],
        'sources': [ 'src/bufferutil.cc' ]
      }
    ]
  }
  
subject: Build -O2 to workaround reported segfaults on gcc 4.9