code: function installGitDependencies(options, cb) {
    var libsassPath = './src/libsass';
  
    if (process.env.LIBSASS_EXT || options.libsassExt) {
      cb();
    } else if (fs.access) { // node 0.12+, iojs 1.0.0+
      fs.access(libsassPath, fs.R_OK, function(err) {
        err && err.code === 'ENOENT' ? initSubmodules(cb) : cb();
      });
    } else { // node < 0.12
      fs.exists(libsassPath, function(exists) {
        exists ? cb() : initSubmodules(cb);
      });
    }
  }
docs: installGitDependencies
  
  @param {Function} cb
  @api private