diff --git a/admin/check.php b/admin/check.php
new file mode 100644
index 0000000..d389007
--- /dev/null
+++ b/admin/check.php
@@ -0,0 +1,221 @@
+<?php
+/**
+ * This software is governed by the CeCILL-B license. If a copy of this license
+ * is not distributed with this file, you can obtain one at
+ * http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt
+ *
+ * Authors of STUdS (initial project): Guilhem BORGHESI (borghesi@unistra.fr) and Raphaël DROZ
+ * Authors of Framadate/OpenSondate: Framasoft (https://github.com/framasoft)
+ *
+ * =============================
+ *
+ * Ce logiciel est régi par la licence CeCILL-B. Si une copie de cette licence
+ * ne se trouve pas avec ce fichier vous pouvez l'obtenir sur
+ * http://www.cecill.info/licences/Licence_CeCILL-B_V1-fr.txt
+ *
+ * Auteurs de STUdS (projet initial) : Guilhem BORGHESI (borghesi@unistra.fr) et Raphaël DROZ
+ * Auteurs de Framadate/OpenSondage : Framasoft (https://github.com/framasoft)
+ */
+
+use Framadate\Message;
+use Framadate\Utils;
+
+define('ROOT_DIR', __DIR__ . '/../');
+
+/**
+ * Checking for missing vendors.
+ */
+if (!file_exists(ROOT_DIR . 'vendor/autoload.php') || !file_exists(ROOT_DIR . 'vendor/o80/i18n/src/shortcuts.php')) {
+    die ("ERROR: You should use <code>composer install</code> to fetch dependant libraries.");
+}
+
+/**
+ * Stripped ini sequence
+ */
+require_once ROOT_DIR . 'vendor/autoload.php';
+require_once ROOT_DIR . 'vendor/o80/i18n/src/shortcuts.php';
+require_once ROOT_DIR . 'app/inc/constants.php';
+if (session_id() == '') {
+    session_start();
+}
+$ALLOWED_LANGUAGES = [
+    'fr' => 'Français',
+    'en' => 'English',
+    'oc' => 'Occitan',
+    'es' => 'Español',
+    'de' => 'Deutsch',
+    'it' => 'Italiano',
+];
+const DEFAULT_LANGUAGE = 'en';
+require_once ROOT_DIR . 'app/inc/i18n.php';
+require_once '../app/inc/php_version.php';
+
+/**
+ * Function to sort messages by type (priorise errors on warning, warning on info, etc.)
+ *
+ * @param Message $a
+ * @param Message $b
+ * @return int
+ */
+function compareCheckMessage(Message $a, Message $b)
+{
+    $values = array(
+        'danger' => 0,
+        'warning' => 1,
+        'info' => 2,
+        'success' => 3
+    );
+    $vA = $values[$a->type];
+    $vB = $values[$b->type];
+
+    if ($vA == $vB) {
+        return 0;
+    }
+    return ($vA < $vB) ? -1 : 1;
+}
+
+
+/**
+ * Vars
+ */
+$messages = array();
+$inc_directory = ROOT_DIR. 'app/inc/';
+$conf_filename = $inc_directory . 'config.php';
+
+/**
+ * Messages
+ */
+
+// PHP Version
+if (PHP_VERSION_ID >= php_string_to_version_id(PHP_NEEDED_VERSION)) {
+    $messages[] = new Message('info', __f('Check','PHP version %s is enough (needed at least PHP %s).',phpversion(), PHP_NEEDED_VERSION));
+} else {
+    $messages[] = new Message('danger', __f('Check','Your PHP version (%s) is too old. This application needs at least PHP %s.',phpversion(), PHP_NEEDED_VERSION));
+}
+
+// INTL extension
+if (extension_loaded('intl')) {
+    $messages[] = new Message('info', __('Check','PHP Intl extension is enabled.'));
+} else {
+    $messages[] = new Message('danger', __('Check','You need to enable the PHP Intl extension.'));
+}
+
+// Is template compile dir writable ?
+if (is_writable(ROOT_DIR . COMPILE_DIR)) {
+    $messages[] = new Message('info', __f('Check','The template compile directory (%s) is writable.', realpath(ROOT_DIR . COMPILE_DIR)));
+} else {
+    $messages[] = new Message('danger', __f('Check','The template compile directory (%s) is not writable.', realpath(ROOT_DIR . COMPILE_DIR)));
+}
+
+// Does config.php exists or is writable ?
+if (file_exists($conf_filename)) {
+    $messages[] = new Message('info', __('Check','The config file exists.'));
+} elseif (is_writable($inc_directory)) {
+    $messages[] = new Message('info', __('Check','The config file directory (%s) is writable.', $inc_directory));
+} else {
+    $messages[] = new Message('danger', __f('Check','The config file directory (%s) is not writable and the config file (%s) dos not exists.', $inc_directory, $conf_filename));
+}
+
+// Security
+if (extension_loaded('openssl')) {
+    $messages[] = new Message('info', __('Check','OpenSSL extension loaded.'));
+} else {
+    $messages[] = new Message('warning', __('Check','Consider enabling the PHP extension OpenSSL for increased security.'));
+}
+
+// Datetime
+if (!empty(ini_get('date.timezone'))) {
+    $messages[] = new Message('info', __('Check','date.timezone is set.'));
+} else {
+    $messages[] = new Message('warning', __('Check','Consider setting the date.timezone in php.ini.'));
+}
+
+
+
+// The percentage of steps needed to be ready to launch the application
+$errors = 0;
+$warnings = 0;
+foreach ($messages as $message) {
+    if ($message->type == 'danger') {
+        $errors++;
+    } else if ($message->type == 'warning')
+        $warnings++;
+}
+$readyPercentage = round((count($messages)-$errors)*100/count($messages));
+$readyClass = 'success';
+if ($errors > 0) {
+    $readyClass = 'danger';
+} else if ($warnings > 0) {
+    $readyClass = 'warning';
+}
+
+usort($messages, 'compareCheckMessage');
+
+?>
+<!DOCTYPE html>
+<html lang="<?=$locale?>">
+<head>
+    <meta charset="utf-8">
+
+   <title><?=__('Check', 'Installation checking') ?></title>
+
+    <link rel="stylesheet" href="../css/bootstrap.min.css">
+    <link rel="stylesheet" href="../css/style.css">
+    <link rel="stylesheet" href="../css/frama.css">
+</head>
+<body>
+    <div class="container ombre">
+        <div class="row">
+            <form method="get" action="" class="hidden-print">
+                <div class="input-group input-group-sm pull-right col-xs-12 col-sm-2">
+                    <select name="lang" class="form-control" title="<?=__('Language selector', 'Select the language')?>" >
+                        <?php foreach ($ALLOWED_LANGUAGES as $lang_key => $language) { ?>
+                        <option lang="fr" <?php if (substr($lang_key, 0, 2)==$locale) { echo 'selected';} ?> value="<?=substr($lang_key, 0, 2)?>"><?=$language?></option>
+                        <?php } ?>
+                    </select>
+                <span class="input-group-btn">
+                    <button type="submit" class="btn btn-default btn-sm" title="<?=__('Language selector', 'Select the language')?>">OK</button>
+                </span>
+                </div>
+            </form>
+        </div>
+        <div class="row">
+            <div class="col-md-12">
+                <h1><?=__('Check', 'Installation checking') ?></h1>
+                <div>
+                    <div class="progress">
+                        <div class="progress-bar  progress-bar-<?= $readyClass ?>" role="progressbar" aria-valuenow="<?= $readyPercentage ?>" aria-valuemin="0" aria-valuemax="100" style="width: <?= $readyPercentage ?>%;">
+                            <?= $readyPercentage ?>%
+                        </div>
+                    </div>
+                </div>
+                <div>
+                    <?php
+                        foreach ($messages as $message) {
+                            echo '<div class="alert alert-'. $message->type .'" role="alert">';
+                            echo Utils::htmlEscape($message->message);
+                            echo '<span class="sr-only">'. $message->type .'</span>';
+                            echo '</div>';
+                         }
+                    ?>
+                </div>
+            </div>
+            <div class="text-center">
+                <a class="btn btn-info" role="button" href=""><span class="glyphicon glyphicon-refresh" aria-hidden="true"></span> <?= __('Check', 'Check again') ?></a>
+                <?php
+                if (!is_file($conf_filename)) {
+                    if ($errors == 0) {
+                ?>
+                    <a class="btn btn-primary" role="button" href="<?= Utils::get_server_name() . 'admin/install.php' ?>"><span class=" glyphicon glyphicon-arrow-right" aria-hidden="true"></span> <?= __('Check', 'Continue the installation') ?></a>
+                <?php
+                    }
+                } else {
+                ?>
+                    <a class="btn btn-primary" role="button" href="<?= Utils::get_server_name() . 'admin/'?>"><span class=" glyphicon glyphicon-arrow-left" aria-hidden="true"></span> <?= __('Admin', 'Back to administration') ?></a>
+                <?php
+                }
+                ?>
+            </div>
+        </div>
+    </div>
+</body>
\ No newline at end of file
diff --git a/app/inc/constants.php b/app/inc/constants.php
index 642072f..c559860 100644
--- a/app/inc/constants.php
+++ b/app/inc/constants.php
@@ -20,6 +20,12 @@
 // FRAMADATE version
 const VERSION = '1.0';
 
+// PHP Needed version
+const PHP_NEEDED_VERSION = '5.4.4';
+
+// Config constants
+const COMPILE_DIR = '/tpl_c/';
+
 // Regex
 const POLL_REGEX = '/^[a-z0-9-]*$/i';
 const ADMIN_POLL_REGEX = '/^[a-z0-9]{24}$/i';
diff --git a/app/inc/php_version.php b/app/inc/php_version.php
new file mode 100644
index 0000000..c837b9a
--- /dev/null
+++ b/app/inc/php_version.php
@@ -0,0 +1,29 @@
+<?php
+
+
+function php_version_id_to_string($versionId) {
+    $major = substr($versionId, 0, 2);
+    $minor = substr($versionId, 2, 2);
+    $release = substr($versionId, 4, 2);
+    return $major.'.'.$minor.'.'.$release;
+}
+function php_version_to_version_id($major, $minor, $release) {
+    return ($major * 10000 +$minor * 100 + $release);
+}
+function php_string_to_version_id($version) {
+    $version = explode('.', $version);
+    return php_version_to_version_id($version[0], $version[1], $version[2]);
+}
+
+
+if (!defined('PHP_VERSION_ID')) {
+    $version = explode('.',PHP_VERSION);
+    define('PHP_VERSION_ID', php_version_to_version_id($version[0], $version[1], $version[2]));
+}
+if (PHP_VERSION_ID < 50207) { // This constants do not exists before 5.2.7
+    define('PHP_MAJOR_VERSION',   $version[0]);
+    define('PHP_MINOR_VERSION',   $version[1]);
+    define('PHP_RELEASE_VERSION', $version[2]);
+}
+
+?>
\ No newline at end of file
diff --git a/app/inc/smarty.php b/app/inc/smarty.php
index 7dfb2a4..39f191c 100644
--- a/app/inc/smarty.php
+++ b/app/inc/smarty.php
@@ -21,7 +21,7 @@ use Framadate\Utils;
 require_once __DIR__ . '/../../vendor/smarty/smarty/libs/Smarty.class.php';
 $smarty = new \Smarty();
 $smarty->setTemplateDir(ROOT_DIR . '/tpl/');
-$smarty->setCompileDir(ROOT_DIR . '/tpl_c/');
+$smarty->setCompileDir(ROOT_DIR . COMPILE_DIR);
 $smarty->setCacheDir(ROOT_DIR . '/cache/');
 $smarty->caching = false;
 
diff --git a/locale/de.json b/locale/de.json
index 48f5d5d..6d7ce50 100644
--- a/locale/de.json
+++ b/locale/de.json
@@ -384,5 +384,23 @@
         "Passwords do not match": "DE_Les mot de passes ne correspondent pas.",
         "Poll id already used": "DE_L'identifiant est déjà utilisé",
         "You can't select more than %d dates": "DE_Vous ne pouvez pas choisir plus de %d dates"
+    },
+    "Check": {
+        "Installation checking": "DE_Vérifications de l'installation",
+        "Your PHP version (%s) is too old. This application needs at least PHP %s.": "DE_Votre version de PHP (%s) est trop vieille. Cette application a besoin de PHP %s au moins.",
+        "PHP version %s is enough (needed at least PHP %s).": "DE_Version de PHP %s suffisante (nécessite au moins PHP %s).",
+        "You need to enable the PHP Intl extension.": "DE_Vous devez activer l'extension PHP Intl.",
+        "PHP Intl extension is enabled.": "DE_L'extension PHP Intl est activée.",
+        "The template compile directory (%s) is not writable.": "DE_Le dossier de compilation des templates (%s) n'est pas accessible en écriture.",
+        "The template compile directory (%s) is writable.": "DE_Le dossier de compilation des templates (%s) est accessible en écriture.",
+        "The config file directory (%s) is not writable and the config file (%s) dos not exists.": "DE_Le dossier du fichier de configuration (%s) n'est pas accessible en écriture et le fichier de configuration (%s) n'éxiste pas.",
+        "The config file exists.": "DE_Le fichier de configuration existe.",
+        "The config file directory (%s) is writable.": "DE_Le dossier du fichier de configuration (%s) est accessible en écriture.",
+        "OpenSSL extension loaded.": "DE_L'extension PHP OpenSSL est chargée.",
+        "Consider enabling the PHP extension OpenSSL for increased security.": "DE_Veuillez considérer l'activation de l'extension PHP OpenSSL pour améliorer la sécurité.",
+        "date.timezone is set.": "DE_date.timezone est défini.",
+        "Consider setting the date.timezone in php.ini.": "DE_Veuillez considérer la définition de date.timezone dans le php.ini.",
+        "Check again": "DE_Vérifier à nouveau",
+        "Continue the installation": "DE_Continuer l'installation"
     }
 }
diff --git a/locale/en.json b/locale/en.json
index c596ea1..2921bdc 100644
--- a/locale/en.json
+++ b/locale/en.json
@@ -385,5 +385,23 @@
     "Passwords do not match": "Passwords do not match.",
     "Poll id already used": "Identifier is already used",
     "You can't select more than %d dates": "You can't select more than %d dates"
-  }
+  },
+  "Check": {
+    "Installation checking": "Installation checking",
+    "Your PHP version (%s) is too old. This application needs at least PHP %s.": "Your PHP version (%s) is too old. This application needs at least PHP %s.",
+    "PHP version %s is enough (needed at least PHP %s).": "PHP version %s is enough (needed at least PHP %s).",
+    "You need to enable the PHP Intl extension.": "You need to enable the PHP Intl extension.",
+    "PHP Intl extension is enabled.": "PHP Intl extension is enabled.",
+    "The template compile directory (%s) is not writable.": "The template compile directory (%s) is not writable.",
+    "The template compile directory (%s) is writable.": "The template compile directory (%s) is writable.",
+    "The config file directory (%s) is not writable and the config file (%s) dos not exists.": "The config file directory (%s) is not writable and the config file (%s) dos not exists.",
+    "The config file exists.": "The config file exists.",
+    "The config file directory (%s) is writable.": "The config file directory (%s) is writable.",
+    "OpenSSL extension loaded.": "OpenSSL extension loaded.",
+    "Consider enabling the PHP extension OpenSSL for increased security.": "Consider enabling the PHP extension OpenSSL for increased security.",
+    "date.timezone is set.": "date.timezone is set.",
+    "Consider setting the date.timezone in php.ini.": "Consider setting the date.timezone in php.ini.",
+    "Check again": "Check again",
+    "Continue the installation": "Continue the installation"
+    }
 }
\ No newline at end of file
diff --git a/locale/es.json b/locale/es.json
index 8294599..5eec32a 100644
--- a/locale/es.json
+++ b/locale/es.json
@@ -384,5 +384,23 @@
     "Passwords do not match": "ES_Les mot de passes ne correspondent pas.",
     "Poll id already used": "ES_L'identifiant est déjà utilisé",
     "You can't select more than %d dates": "ES_Vous ne pouvez pas choisir plus de %d dates"
-  }
+  },
+  "Check": {
+    "Installation checking": "ES_Vérifications de l'installation",
+    "Your PHP version (%s) is too old. This application needs at least PHP %s.": "ES_Votre version de PHP (%s) est trop vieille. Cette application a besoin de PHP %s au moins.",
+    "PHP version %s is enough (needed at least PHP %s).": "ES_Version de PHP %s suffisante (nécessite au moins PHP %s).",
+    "You need to enable the PHP Intl extension.": "ES_Vous devez activer l'extension PHP Intl.",
+    "PHP Intl extension is enabled.": "ES_L'extension PHP Intl est activée.",
+    "The template compile directory (%s) is not writable.": "ES_Le dossier de compilation des templates (%s) n'est pas accessible en écriture.",
+    "The template compile directory (%s) is writable.": "ES_Le dossier de compilation des templates (%s) est accessible en écriture.",
+    "The config file directory (%s) is not writable and the config file (%s) dos not exists.": "ES_Le dossier du fichier de configuration (%s) n'est pas accessible en écriture et le fichier de configuration (%s) n'éxiste pas.",
+    "The config file exists.": "ES_Le fichier de configuration existe.",
+    "The config file directory (%s) is writable.": "ES_Le dossier du fichier de configuration (%s) est accessible en écriture.",
+    "OpenSSL extension loaded.": "ES_L'extension PHP OpenSSL est chargée.",
+    "Consider enabling the PHP extension OpenSSL for increased security.": "ES_Veuillez considérer l'activation de l'extension PHP OpenSSL pour améliorer la sécurité.",
+    "date.timezone is set.": "ES_date.timezone est défini.",
+    "Consider setting the date.timezone in php.ini.": "ES_Veuillez considérer la définition de date.timezone dans le php.ini.",
+    "Check again": "ES_Vérifier à nouveau",
+    "Continue the installation": "ES_Continuer l'installation"
+    }
 }
diff --git a/locale/fr.json b/locale/fr.json
index ae6515e..7ce19f9 100644
--- a/locale/fr.json
+++ b/locale/fr.json
@@ -398,5 +398,23 @@
     "Passwords do not match": "Les mots de passe ne correspondent pas.",
     "Poll id already used": "L'identifiant est déjà utilisé",
     "You can't select more than %d dates": "Vous ne pouvez pas choisir plus de %d dates"
+  },
+  "Check": {
+    "Installation checking": "Vérifications de l'installation",
+    "Your PHP version (%s) is too old. This application needs at least PHP %s.": "Votre version de PHP (%s) est trop vieille. Cette application a besoin de PHP %s au moins.",
+    "PHP version %s is enough (needed at least PHP %s).": "Version de PHP %s suffisante (nécessite au moins PHP %s).",
+    "You need to enable the PHP Intl extension.": "Vous devez activer l'extension PHP Intl.",
+    "PHP Intl extension is enabled.": "L'extension PHP Intl est activée.",
+    "The template compile directory (%s) is not writable.": "Le dossier de compilation des templates (%s) n'est pas accessible en écriture.",
+    "The template compile directory (%s) is writable.": "Le dossier de compilation des templates (%s) est accessible en écriture.",
+    "The config file directory (%s) is not writable and the config file (%s) dos not exists.": "Le dossier du fichier de configuration (%s) n'est pas accessible en écriture et le fichier de configuration (%s) n'éxiste pas.",
+    "The config file exists.": "Le fichier de configuration existe.",
+    "The config file directory (%s) is writable.": "Le dossier du fichier de configuration (%s) est accessible en écriture.",
+    "OpenSSL extension loaded.": "L'extension PHP OpenSSL est chargée.",
+    "Consider enabling the PHP extension OpenSSL for increased security.": "Veuillez considérer l'activation de l'extension PHP OpenSSL pour améliorer la sécurité.",
+    "date.timezone is set.": "date.timezone est défini.",
+    "Consider setting the date.timezone in php.ini.": "Veuillez considérer la définition de date.timezone dans le php.ini.",
+    "Check again": "Vérifier à nouveau",
+    "Continue the installation": "Continuer l'installation"
   }
 }
\ No newline at end of file
diff --git a/locale/it.json b/locale/it.json
index bd35988..5595587 100644
--- a/locale/it.json
+++ b/locale/it.json
@@ -382,5 +382,23 @@
     "CANT_CONNECT_TO_DATABASE": "Impossibile connettersi al database",
     "Poll id already used": "IT_L'identifiant est déjà utilisé",
     "You can't select more than %d dates": "IT_Vous ne pouvez pas choisir plus de %d dates"
-  }
+  },
+  "Check": {
+    "Installation checking": "IT_Vérifications de l'installation",
+    "Your PHP version (%s) is too old. This application needs at least PHP %s.": "IT_Votre version de PHP (%s) est trop vieille. Cette application a besoin de PHP %s au moins.",
+    "PHP version %s is enough (needed at least PHP %s).": "IT_Version de PHP %s suffisante (nécessite au moins PHP %s).",
+    "You need to enable the PHP Intl extension.": "IT_Vous devez activer l'extension PHP Intl.",
+    "PHP Intl extension is enabled.": "IT_L'extension PHP Intl est activée.",
+    "The template compile directory (%s) is not writable.": "IT_Le dossier de compilation des templates (%s) n'est pas accessible en écriture.",
+    "The template compile directory (%s) is writable.": "IT_Le dossier de compilation des templates (%s) est accessible en écriture.",
+    "The config file directory (%s) is not writable and the config file (%s) dos not exists.": "IT_Le dossier du fichier de configuration (%s) n'est pas accessible en écriture et le fichier de configuration (%s) n'éxiste pas.",
+    "The config file exists.": "IT_Le fichier de configuration existe.",
+    "The config file directory (%s) is writable.": "IT_Le dossier du fichier de configuration (%s) est accessible en écriture.",
+    "OpenSSL extension loaded.": "IT_L'extension PHP OpenSSL est chargée.",
+    "Consider enabling the PHP extension OpenSSL for increased security.": "IT_Veuillez considérer l'activation de l'extension PHP OpenSSL pour améliorer la sécurité.",
+    "date.timezone is set.": "IT_date.timezone est défini.",
+    "Consider setting the date.timezone in php.ini.": "IT_Veuillez considérer la définition de date.timezone dans le php.ini.",
+    "Check again": "IT_Vérifier à nouveau",
+    "Continue the installation": "IT_Continuer l'installation"
+    }
 }
diff --git a/locale/oc.json b/locale/oc.json
index 765629b..e885df1 100644
--- a/locale/oc.json
+++ b/locale/oc.json
@@ -380,5 +380,23 @@
     "MISSING_VALUES": "Mancan de valors",
     "CANT_CONNECT_TO_DATABASE": "Impossible de se connectar a la banca de donadas",
     "You can't select more than %d dates": "OC_Vous ne pouvez pas choisir plus de %d dates"
-  }
+  },
+  "Check": {
+    "Installation checking": "OC_Vérifications de l'installation",
+    "Your PHP version (%s) is too old. This application needs at least PHP %s.": "OC_Votre version de PHP (%s) est trop vieille. Cette application a besoin de PHP %s au moins.",
+    "PHP version %s is enough (needed at least PHP %s).": "OC_Version de PHP %s suffisante (nécessite au moins PHP %s).",
+    "You need to enable the PHP Intl extension.": "OC_Vous devez activer l'extension PHP Intl.",
+    "PHP Intl extension is enabled.": "OC_L'extension PHP Intl est activée.",
+    "The template compile directory (%s) is not writable.": "OC_Le dossier de compilation des templates (%s) n'est pas accessible en écriture.",
+    "The template compile directory (%s) is writable.": "OC_Le dossier de compilation des templates (%s) est accessible en écriture.",
+    "The config file directory (%s) is not writable and the config file (%s) dos not exists.": "OC_Le dossier du fichier de configuration (%s) n'est pas accessible en écriture et le fichier de configuration (%s) n'éxiste pas.",
+    "The config file exists.": "OC_Le fichier de configuration existe.",
+    "The config file directory (%s) is writable.": "OC_Le dossier du fichier de configuration (%s) est accessible en écriture.",
+    "OpenSSL extension loaded.": "OC_L'extension PHP OpenSSL est chargée.",
+    "Consider enabling the PHP extension OpenSSL for increased security.": "OC_Veuillez considérer l'activation de l'extension PHP OpenSSL pour améliorer la sécurité.",
+    "date.timezone is set.": "OC_date.timezone est défini.",
+    "Consider setting the date.timezone in php.ini.": "OC_Veuillez considérer la définition de date.timezone dans le php.ini.",
+    "Check again": "OC_Vérifier à nouveau",
+    "Continue the installation": "OC_Continuer l'installation"
+    }
 }
\ No newline at end of file