diff --git a/inst/reveal.js-4.2.1/gulpfile.js b/inst/reveal.js-4.2.1/gulpfile.js
new file mode 100644
index 0000000..23a25a8
--- /dev/null
+++ b/inst/reveal.js-4.2.1/gulpfile.js
@@ -0,0 +1,315 @@
+const pkg = require('./package.json')
+const path = require('path')
+const glob = require('glob')
+const yargs = require('yargs')
+const colors = require('colors')
+const through = require('through2');
+const qunit = require('node-qunit-puppeteer')
+
+const {rollup} = require('rollup')
+const {terser} = require('rollup-plugin-terser')
+const babel = require('@rollup/plugin-babel').default
+const commonjs = require('@rollup/plugin-commonjs')
+const resolve = require('@rollup/plugin-node-resolve').default
+const sass = require('sass')
+
+const gulp = require('gulp')
+const tap = require('gulp-tap')
+const zip = require('gulp-zip')
+const header = require('gulp-header')
+const eslint = require('gulp-eslint')
+const minify = require('gulp-clean-css')
+const connect = require('gulp-connect')
+const autoprefixer = require('gulp-autoprefixer')
+
+const root = yargs.argv.root || '.'
+const port = yargs.argv.port || 8000
+const host = yargs.argv.host || 'localhost'
+
+const banner = `/*!
+* reveal.js ${pkg.version}
+* ${pkg.homepage}
+* MIT licensed
+*
+* Copyright (C) 2011-2021 Hakim El Hattab, https://hakim.se
+*/\n`
+
+// Prevents warnings from opening too many test pages
+process.setMaxListeners(20);
+
+const babelConfig = {
+    babelHelpers: 'bundled',
+    ignore: ['node_modules'],
+    compact: false,
+    extensions: ['.js', '.html'],
+    plugins: [
+        'transform-html-import-to-string'
+    ],
+    presets: [[
+        '@babel/preset-env',
+        {
+            corejs: 3,
+            useBuiltIns: 'usage',
+            modules: false
+        }
+    ]]
+};
+
+// Our ES module bundle only targets newer browsers with
+// module support. Browsers are targeted explicitly instead
+// of using the "esmodule: true" target since that leads to
+// polyfilling older browsers and a larger bundle.
+const babelConfigESM = JSON.parse( JSON.stringify( babelConfig ) );
+babelConfigESM.presets[0][1].targets = { browsers: [
+    'last 2 Chrome versions',
+    'last 2 Safari versions',
+    'last 2 iOS versions',
+    'last 2 Firefox versions',
+    'last 2 Edge versions',
+] };
+
+let cache = {};
+
+// Creates a bundle with broad browser support, exposed
+// as UMD
+gulp.task('js-es5', () => {
+    return rollup({
+        cache: cache.umd,
+        input: 'js/index.js',
+        plugins: [
+            resolve(),
+            commonjs(),
+            babel( babelConfig ),
+            terser()
+        ]
+    }).then( bundle => {
+        cache.umd = bundle.cache;
+        return bundle.write({
+            name: 'Reveal',
+            file: './dist/reveal.js',
+            format: 'umd',
+            banner: banner,
+            sourcemap: true
+        });
+    });
+})
+
+// Creates an ES module bundle
+gulp.task('js-es6', () => {
+    return rollup({
+        cache: cache.esm,
+        input: 'js/index.js',
+        plugins: [
+            resolve(),
+            commonjs(),
+            babel( babelConfigESM ),
+            terser()
+        ]
+    }).then( bundle => {
+        cache.esm = bundle.cache;
+        return bundle.write({
+            file: './dist/reveal.esm.js',
+            format: 'es',
+            banner: banner,
+            sourcemap: true
+        });
+    });
+})
+gulp.task('js', gulp.parallel('js-es5', 'js-es6'));
+
+// Creates a UMD and ES module bundle for each of our
+// built-in plugins
+gulp.task('plugins', () => {
+    return Promise.all([
+        { name: 'RevealHighlight', input: './plugin/highlight/plugin.js', output: './plugin/highlight/highlight' },
+        { name: 'RevealMarkdown', input: './plugin/markdown/plugin.js', output: './plugin/markdown/markdown' },
+        { name: 'RevealSearch', input: './plugin/search/plugin.js', output: './plugin/search/search' },
+        { name: 'RevealNotes', input: './plugin/notes/plugin.js', output: './plugin/notes/notes' },
+        { name: 'RevealZoom', input: './plugin/zoom/plugin.js', output: './plugin/zoom/zoom' },
+        { name: 'RevealMath', input: './plugin/math/plugin.js', output: './plugin/math/math' },
+    ].map( plugin => {
+        return rollup({
+                cache: cache[plugin.input],
+                input: plugin.input,
+                plugins: [
+                    resolve(),
+                    commonjs(),
+                    babel({
+                        ...babelConfig,
+                        ignore: [/node_modules\/(?!(highlight\.js|marked)\/).*/],
+                    }),
+                    terser()
+                ]
+            }).then( bundle => {
+                cache[plugin.input] = bundle.cache;
+                bundle.write({
+                    file: plugin.output + '.esm.js',
+                    name: plugin.name,
+                    format: 'es'
+                })
+
+                bundle.write({
+                    file: plugin.output + '.js',
+                    name: plugin.name,
+                    format: 'umd'
+                })
+            });
+    } ));
+})
+
+// a custom pipeable step to transform Sass to CSS
+function compileSass() {
+  return through.obj( ( vinylFile, encoding, callback ) => {
+    const transformedFile = vinylFile.clone();
+
+    sass.render({
+        data: transformedFile.contents.toString(),
+        includePaths: ['css/', 'css/theme/template']
+    }, ( err, result ) => {
+        if( err ) {
+            console.log( vinylFile.path );
+            console.log( err.formatted );
+        }
+        else {
+            transformedFile.extname = '.css';
+            transformedFile.contents = result.css;
+            callback( null, transformedFile );
+        }
+    });
+  });
+}
+
+gulp.task('css-themes', () => gulp.src(['./css/theme/source/*.{sass,scss}'])
+        .pipe(compileSass())
+        .pipe(gulp.dest('./dist/theme')))
+
+gulp.task('css-core', () => gulp.src(['css/reveal.scss'])
+    .pipe(compileSass())
+    .pipe(autoprefixer())
+    .pipe(minify({compatibility: 'ie9'}))
+    .pipe(header(banner))
+    .pipe(gulp.dest('./dist')))
+
+gulp.task('css', gulp.parallel('css-themes', 'css-core'))
+
+gulp.task('qunit', () => {
+
+    let serverConfig = {
+        root,
+        port: 8009,
+        host: 'localhost',
+        name: 'test-server'
+    }
+
+    let server = connect.server( serverConfig )
+
+    let testFiles = glob.sync('test/*.html' )
+
+    let totalTests = 0;
+    let failingTests = 0;
+
+    let tests = Promise.all( testFiles.map( filename => {
+        return new Promise( ( resolve, reject ) => {
+            qunit.runQunitPuppeteer({
+                targetUrl: `http://${serverConfig.host}:${serverConfig.port}/${filename}`,
+                timeout: 20000,
+                redirectConsole: false,
+                puppeteerArgs: ['--allow-file-access-from-files']
+            })
+                .then(result => {
+                    if( result.stats.failed > 0 ) {
+                        console.log(`${'!'} ${filename} [${result.stats.passed}/${result.stats.total}] in ${result.stats.runtime}ms`.red);
+                        // qunit.printResultSummary(result, console);
+                        qunit.printFailedTests(result, console);
+                    }
+                    else {
+                        console.log(`${'✔'} ${filename} [${result.stats.passed}/${result.stats.total}] in ${result.stats.runtime}ms`.green);
+                    }
+
+                    totalTests += result.stats.total;
+                    failingTests += result.stats.failed;
+
+                    resolve();
+                })
+                .catch(error => {
+                    console.error(error);
+                    reject();
+                });
+        } )
+    } ) );
+
+    return new Promise( ( resolve, reject ) => {
+
+        tests.then( () => {
+                if( failingTests > 0 ) {
+                    reject( new Error(`${failingTests}/${totalTests} tests failed`.red) );
+                }
+                else {
+                    console.log(`${'✔'} Passed ${totalTests} tests`.green.bold);
+                    resolve();
+                }
+            } )
+            .catch( () => {
+                reject();
+            } )
+            .finally( () => {
+                server.close();
+            } );
+
+    } );
+} )
+
+gulp.task('eslint', () => gulp.src(['./js/**', 'gulpfile.js'])
+        .pipe(eslint())
+        .pipe(eslint.format()))
+
+gulp.task('test', gulp.series( 'eslint', 'qunit' ))
+
+gulp.task('default', gulp.series(gulp.parallel('js', 'css', 'plugins'), 'test'))
+
+gulp.task('build', gulp.parallel('js', 'css', 'plugins'))
+
+gulp.task('package', gulp.series('default', () =>
+
+    gulp.src([
+        './index.html',
+        './dist/**',
+        './lib/**',
+        './images/**',
+        './plugin/**',
+        './**.md'
+    ]).pipe(zip('reveal-js-presentation.zip')).pipe(gulp.dest('./'))
+
+))
+
+gulp.task('reload', () => gulp.src(['*.html', '*.md'])
+    .pipe(connect.reload()));
+
+gulp.task('serve', () => {
+
+    connect.server({
+        root: root,
+        port: port,
+        host: host,
+        livereload: true
+    })
+
+    gulp.watch(['*.html', '*.md'], gulp.series('reload'))
+
+    gulp.watch(['js/**'], gulp.series('js', 'reload', 'eslint'))
+
+    gulp.watch(['plugin/**/plugin.js'], gulp.series('plugins', 'reload'))
+
+    gulp.watch([
+        'css/theme/source/*.{sass,scss}',
+        'css/theme/template/*.{sass,scss}',
+    ], gulp.series('css-themes', 'reload'))
+
+    gulp.watch([
+        'css/*.scss',
+        'css/print/*.{sass,scss,css}'
+    ], gulp.series('css-core', 'reload'))
+
+    gulp.watch(['test/*.html'], gulp.series('test'))
+
+})
\ No newline at end of file