diff --git a/install/index.php b/install/index.php
index 599bbe2bb..e63b24239 100644
--- a/install/index.php
+++ b/install/index.php
@@ -1,9 +1,30 @@
 <?php
 $errors = array();
 $successes = array();
+
+/* Function taken from at http://php.net/manual/en/function.rmdir.php#110489
+ * Idea : nbari at dalmp dot com
+ * Rights unknown
+ * Here in case of .gitignore files
+ */
+function delTree($dir) {
+    $files = array_diff(scandir($dir), array('.','..'));
+    foreach ($files as $file) {
+      (is_dir("$dir/$file")) ? delTree("$dir/$file") : unlink("$dir/$file");
+    }
+    return rmdir($dir);
+  }
+
+if (isset($_GET['clean'])) {
+    if (is_dir('install')){
+    delTree('install');
+    header('Location: index.php');      
+    }
+}
+
 if (isset($_POST['download'])) {
     if (!file_put_contents("cache/vendor.zip", fopen("http://static.wallabag.org/files/vendor.zip", 'r'))) {
-        $errors[] = 'Impossible to download vendor.zip. Please <a href="http://wllbg.org/vendor">download it manually<∕a> and unzip it in your wallabag folder.';
+        $errors[] = 'Impossible to download vendor.zip. Please <a href="http://wllbg.org/vendor">download it manually<∕a> and unzip it in your wallabag folder.';
     }
     else {
         if (extension_loaded('zip')) {
@@ -64,11 +85,11 @@ else if (isset($_POST['install'])) {
                 else {
                     $db_path = 'sqlite:' . realpath('') . '/db/poche.sqlite';
                     $handle = new PDO($db_path);
+                    $sql_structure = "";
                 }
             }
             else {
                 $content = file_get_contents('inc/poche/config.inc.php');
-                $sql_structure = '';
 
                 if ($_POST['db_engine'] == 'mysql') {
                     $db_path = 'mysql:host=' . $_POST['mysql_server'] . ';dbname=' . $_POST['mysql_database'];
@@ -130,7 +151,7 @@ else if (isset($_POST['install'])) {
                 $params = array($id_user, 'language', 'en_EN.UTF8');
                 $query = executeQuery($handle, $sql, $params);
 
-                $successes[] = 'wallabag is now installed. Don\'t forget to delete install folder. Then, <a href="index.php">reload this page</a>.';
+                $successes[] = 'wallabag is now installed. You can now <a href="index.php?clean=0">access it !</a>';
             }
         }
     }
@@ -144,7 +165,7 @@ else if (isset($_POST['install'])) {
         <!--[if IE]>
         <meta http-equiv="X-UA-Compatible" content="IE=10">
         <![endif]-->
-        <title>wallabag — installation</title>
+        <title>wallabag — installation</title>
         <link rel="shortcut icon" type="image/x-icon" href="themes/baggy/img/favicon.ico" />
         <link rel="apple-touch-icon-precomposed" sizes="144x144" href="themes/baggy/img/apple-touch-icon-144x144-precomposed.png">
         <link rel="apple-touch-icon-precomposed" sizes="72x72" href="themes/baggy/img/apple-touch-icon-72x72-precomposed.png">
@@ -199,18 +220,18 @@ else if (isset($_POST['install'])) {
                 <?php if (file_exists('inc/poche/config.inc.php') && is_dir('vendor')) : ?>
                 <div class='messages success install'>
                     <p>
-                        wallabag seems already installed. If you want to update it, you only have to delete install folder.
+                        wallabag seems already installed. If you want to update it, you only have to delete install folder, then <a href="index.php">reload this page</a>.
                     </p>
                 </div>
                 <?php endif; ?>    
             <?php endif; ?>
             <p>To install wallabag, you just have to fill the following fields. That's all.</p>
-            <p>Don't forget to check your server compatibility <a href="wallabag_compatibility_test.php">here</a>.</p>
+            <p>Don't forget to check your server compatibility <a href="wallabag_compatibility_test.php?from=install">here</a>.</p>
             <form method="post">
                 <fieldset>
                     <legend><strong>Technical settings</strong></legend>
                     <?php if (!is_dir('vendor')) : ?>
-                        <div class='messages notice install'>wallabag needs twig, a template engine (<a href="http://twig.sensiolabs.org/">?</a>). Two ways to install it: 
+                        <div class='messages notice install'>wallabag needs twig, a template engine (<a href="http://twig.sensiolabs.org/">?</a>). Two ways to install it:<br />
                         <ul>
                             <li>automatically download and extract vendor.zip into your wallabag folder. 
                             <p><input type="submit" name="download" value="Download vendor.zip" /></p>
@@ -226,7 +247,11 @@ php composer.phar install</code></pre></li>
                     <p>
                         Database engine:
                         <ul>
-                            <li><label for="sqlite">SQLite</label> <input name="db_engine" type="radio" checked="" id="sqlite" value="sqlite" /></li>
+                            <li><label for="sqlite">SQLite</label> <input name="db_engine" type="radio" checked="" id="sqlite" value="sqlite" />
+                            <div id="pdo_sqlite" class='messages error install'>
+                                <p>You have to enable <a href="http://php.net/manual/ref.pdo-sqlite.php">pdo_sqlite extension</a>.</p>
+                            </div>
+                            </li>
                             <li>
                                 <label for="mysql">MySQL</label> <input name="db_engine" type="radio" id="mysql" value="mysql" />
                                 <ul id="mysql_infos">
@@ -242,7 +267,7 @@ php composer.phar install</code></pre></li>
                                     <li><label for="pg_server">Server</label> <input type="text" placeholder="localhost" id="pg_server" name="pg_server" /></li>
                                     <li><label for="pg_database">Database</label> <input type="text" placeholder="wallabag" id="pg_database" name="pg_database" /></li>
                                     <li><label for="pg_user">User</label> <input type="text" placeholder="user" id="pg_user" name="pg_user" /></li>
-                                  id  <li><label for="pg_password">Password</label> <input type="text" placeholder="p4ssw0rd" id="pg_password" name="pg_password" /></li>
+                                    <li><label for="pg_password">Password</label> <input type="text" placeholder="p4ssw0rd" id="pg_password" name="pg_password" /></li>
                                 </ul>
                             </li>
                         </ul>
@@ -264,26 +289,49 @@ php composer.phar install</code></pre></li>
                     </p>
                 </fieldset>
 
-                <input type="submit" value="Install wallabag" name="install" />
+                <input type="submit" id="install_button" value="Install wallabag" name="install" />
             </form>
         </div>
         <script>
             $("#mysql_infos").hide();
             $("#pg_infos").hide();
+
+            <?php
+            if (!extension_loaded('pdo_sqlite')) : ?>
+            $("#install_button").hide();
+            <?php
+            else :
+            ?>
+            $("#pdo_sqlite").hide();
+            <?php
+            endif;
+            ?>
+
             $("input[name=db_engine]").click(function() 
                 {
                     if ( $("#mysql").prop('checked')) {
                         $("#mysql_infos").show();
                         $("#pg_infos").hide();
+                        $("#pdo_sqlite").hide();
+                        $("#install_button").show();
                     }
                     else {
                         if ( $("#postgresql").prop('checked')) {
                             $("#mysql_infos").hide();
                             $("#pg_infos").show();
+                            $("#pdo_sqlite").hide();
+                            $("#install_button").show();
                         }
                         else {
                             $("#mysql_infos").hide();
                             $("#pg_infos").hide();
+                            <?php
+                            if (!extension_loaded('pdo_sqlite')) : ?>
+                            $("#pdo_sqlite").show();
+                            $("#install_button").hide();
+                            <?php
+                            endif;
+                            ?>
                         }
                     }
                 });