function lessChannel() {
    return require('stream-combiner')(
      gulpif('**/*.less', less()),
      // less(), // is properly handled by upstream plumber
      autoprefixer('last 1 version'),
      gulp.dest(src.tmp)
    );
  };
  gulp.task('src/styles', function() {
    gulp.src(src.styles, {cwd: src.cwd, base: src.cwd})
      .pipe(plumber())
      .pipe(lessChannel());
  });