diff --git a/core/oql/build/build.bash b/core/oql/build/build.bash
index eb3c1f6ab..c6c006d4e 100644
--- a/core/oql/build/build.bash
+++ b/core/oql/build/build.bash
@@ -1,4 +1,11 @@
 #!/bin/bash
-php PHP/LexerGenerator/cli.php oql-lexer.plex
-php PHP/ParserGenerator/cli.php oql-parser.y
+#
+# Rebuild the iTop Lexer / Parser
+# PEAR is required to build (really?)
+# Launch this batch from the core/oql/build directory
+# with ./build.bash
+#
+php PHP/LexerGenerator/cli.php ../oql-lexer.plex
+php PHP/ParserGenerator/cli.php ../oql-parser.y
+php -r "echo date('Y-m-d');" > ../version.txt
 
diff --git a/core/oql/build/build.cmd b/core/oql/build/build.cmd
index df34ce8d6..9edd6d3d4 100644
--- a/core/oql/build/build.cmd
+++ b/core/oql/build/build.cmd
@@ -2,4 +2,5 @@ rem must be run with current directory = the directory of the batch
 rem PEAR is required to build
 php -d include_path=".;C:\iTop\PHP\PEAR" ".\PHP\LexerGenerator\cli.php" ..\oql-lexer.plex
 php ".\PHP\ParserGenerator\cli.php" ..\oql-parser.y
+php -r "echo date('Y-m-d');" > ..\version.txt
 pause
\ No newline at end of file
diff --git a/core/oql/version.txt b/core/oql/version.txt
new file mode 100644
index 000000000..25ada144d
--- /dev/null
+++ b/core/oql/version.txt
@@ -0,0 +1 @@
+2015-08-31