diff --git a/htdocs/admin/syslog.php b/htdocs/admin/syslog.php
index 5798bcf0462..10a28ea2fe9 100644
--- a/htdocs/admin/syslog.php
+++ b/htdocs/admin/syslog.php
@@ -130,14 +130,14 @@ $var=true;
 $var=!$var;
 print '<tr '.$bc[$var].'><td width=\"140\">'.$langs->trans("SyslogLevel").'</td>';
 print '<td colspan="2"><select class="flat" name="level">';
-print '<option value="'.LOG_EMERG.'" '.(SYSLOG_LEVEL==LOG_EMERG?'SELECTED':'').'>LOG_EMERG ('.LOG_EMERG.')</option>';
-print '<option value="'.LOG_ALERT.'" '.(SYSLOG_LEVEL==LOG_ALERT?'SELECTED':'').'>LOG_ALERT ('.LOG_ALERT.')</option>';
-print '<option value="'.LOG_CRIT.'" '.(SYSLOG_LEVEL==LOG_CRIT?'SELECTED':'').'>LOG_CRIT ('.LOG_CRIT.')</option>';
-print '<option value="'.LOG_ERR.'" '.(SYSLOG_LEVEL==LOG_ERR?'SELECTED':'').'>LOG_ERR ('.LOG_ERR.')</option>';
-print '<option value="'.LOG_WARNING.'" '.(SYSLOG_LEVEL==LOG_WARNING?'SELECTED':'').'>LOG_WARNING ('.LOG_WARNING.')</option>';
-print '<option value="'.LOG_NOTICE.'" '.(SYSLOG_LEVEL==LOG_NOTICE?'SELECTED':'').'>LOG_NOTICE ('.LOG_NOTICE.')</option>';
-print '<option value="'.LOG_INFO.'" '.(SYSLOG_LEVEL==LOG_INFO?'SELECTED':'').'>LOG_INFO ('.LOG_INFO.')</option>';
-print '<option value="'.LOG_DEBUG.'" '.(SYSLOG_LEVEL==LOG_DEBUG?'SELECTED':'').'>LOG_DEBUG ('.LOG_DEBUG.')</option>';
+print '<option value="'.LOG_EMERG.'" '.($conf->global->SYSLOG_LEVEL==LOG_EMERG?'SELECTED':'').'>LOG_EMERG ('.LOG_EMERG.')</option>';
+print '<option value="'.LOG_ALERT.'" '.($conf->global->SYSLOG_LEVEL==LOG_ALERT?'SELECTED':'').'>LOG_ALERT ('.LOG_ALERT.')</option>';
+print '<option value="'.LOG_CRIT.'" '.($conf->global->SYSLOG_LEVEL==LOG_CRIT?'SELECTED':'').'>LOG_CRIT ('.LOG_CRIT.')</option>';
+print '<option value="'.LOG_ERR.'" '.($conf->global->SYSLOG_LEVEL==LOG_ERR?'SELECTED':'').'>LOG_ERR ('.LOG_ERR.')</option>';
+print '<option value="'.LOG_WARNING.'" '.($conf->global->SYSLOG_LEVEL==LOG_WARNING?'SELECTED':'').'>LOG_WARNING ('.LOG_WARNING.')</option>';
+print '<option value="'.LOG_NOTICE.'" '.($conf->global->SYSLOG_LEVEL==LOG_NOTICE?'SELECTED':'').'>LOG_NOTICE ('.LOG_NOTICE.')</option>';
+print '<option value="'.LOG_INFO.'" '.($conf->global->SYSLOG_LEVEL==LOG_INFO?'SELECTED':'').'>LOG_INFO ('.LOG_INFO.')</option>';
+print '<option value="'.LOG_DEBUG.'" '.($conf->global->SYSLOG_LEVEL==LOG_DEBUG?'SELECTED':'').'>LOG_DEBUG ('.LOG_DEBUG.')</option>';
 print '</select>';
 print '</td></tr>';
 print '</table>';
diff --git a/htdocs/install/inc.php b/htdocs/install/inc.php
index 8fdcb57dae3..f607bd2ea4f 100644
--- a/htdocs/install/inc.php
+++ b/htdocs/install/inc.php
@@ -61,11 +61,12 @@ define('DOL_DOCUMENT_ROOT','../');
 
 // Forcage du log pour les install et mises a jour
 $conf->syslog->enabled=1;
-define('SYSLOG_FILE','/tmp/dolibarr_install.log');
+$conf->global->SYSLOG_LEVEL=constant('LOG_DEBUG');
+if (file_exists('/tmp')) define('SYSLOG_FILE','/tmp/dolibarr_install.log');
+else define('SYSLOG_FILE','/dolibarr_install.log');
 define('SYSLOG_FILE_NO_ERROR',1);
 
 
-
 // Forcage du parametrage PHP magic_quots_gpc (Sinon il faudrait a chaque POST, conditionner
 // la lecture de variable par stripslashes selon etat de get_magic_quotes).
 // En mode off (recommande il faut juste faire addslashes au moment d'un insert/update.
@@ -151,7 +152,8 @@ function pFooter($nonext=0,$setuplang='')
 
 function dolibarr_install_syslog($message)
 {
-	dolibarr_syslog($message);
+	if (! defined('LOG_DEBUG')) define('LOG_DEBUG',6);
+	dolibarr_syslog($message,constant('LOG_DEBUG'));
 }
 
 ?>
\ No newline at end of file
diff --git a/htdocs/lib/functions.inc.php b/htdocs/lib/functions.inc.php
index 54d6983d125..7aec87490f7 100644
--- a/htdocs/lib/functions.inc.php
+++ b/htdocs/lib/functions.inc.php
@@ -170,7 +170,8 @@ function dolibarr_syslog($message, $level=LOG_INFO)
 
 	if ($conf->syslog->enabled)
 	{
-		if ($level > SYSLOG_LEVEL) return;
+		//print $level.' - '.$conf->global->SYSLOG_LEVEL.' - '.$conf->syslog->enabled;
+		if ($level > $conf->global->SYSLOG_LEVEL) return;
 		
 		// Ajout user a la log
 		$login='???';
diff --git a/htdocs/master.inc.php b/htdocs/master.inc.php
index 82f588ddb64..5f2dafe9354 100644
--- a/htdocs/master.inc.php
+++ b/htdocs/master.inc.php
@@ -35,17 +35,31 @@
 define('DOL_VERSION','2.2-dev');
 define('EURO',chr(128)); 
 
-// La fonction clearstatcache ne doit pas etre appelé de manière globale car ralenti.
+// La fonction clearstatcache ne doit pas etre appelée de manière globale car ralenti.
 // Elle doit etre appelée uniquement par les pages qui ont besoin d'un cache fichier vidé
 // comme par exemple document.php
 //clearstatcache();     
 
-// Forcage du parametrage PHP error_reporting (Dolibarr non utilisable en mode error E_ALL)
+// Definition des constantes syslog
 if (function_exists("define_syslog_variables"))
 {
     define_syslog_variables();
 }
-//error_reporting(E_ALL);
+else
+{
+	// Pour PHP sans syslog (comme sous Windows)
+	define('LOG_EMERG',0);
+	define('LOG_ALERT',1);
+	define('LOG_CRIT',2);
+	define('LOG_ERR',3);
+	define('LOG_WARNING',4);
+	define('LOG_NOTICE',5);
+	define('LOG_INFO',6);
+	define('LOG_DEBUG',7);
+}
+
+// Forcage du parametrage PHP error_reporting (Dolibarr non utilisable en mode error E_ALL)
+// error_reporting(E_ALL);
 error_reporting(E_ALL ^ E_NOTICE);
 
 // Test si install ok