gulpfile.js

var gulp = require("gulp");
var sass = require("gulp-sass");
var Eyeglass = require("eyeglass").Eyeglass;

var eyeglass = new Eyeglass({
  // ... node-sass options
    importer: function(uri, prev, done) {
        done(sass.compiler.types.NULL);
    }
});

// Disable import once with gulp until we
// figure out how to make them work together.
eyeglass.enableImportOnce = false

gulp.task("sass", function () {
  gulp.src("./sass/**/*.scss")
    .pipe(sass(eyeglass.sassOptions()).on("error", sass.logError))
    .pipe(gulp.dest("./css"));
});

package.json

{
  "devDependencies": {
    "eyeglass": "^0.6.2",
    "gulp": "^3.9.0",
    "gulp-sass": "^2.0.4",
    "susy": "^2.2.5"
  }
}