fix win32 build

diff --git a/win32/build/config.w32 b/win32/build/config.w32
index b351e10f6a1b55daf55d6e3b8e31d6d5062720c9..c270de4b2b291fa4f45733ad7e9832df5b9bc894 100644 (file)
--- a/win32/build/config.w32
+++ b/win32/build/config.w32
@@ -60,7 +60,7 @@ if (!PATH_PROG('bison')) {
 if (!PATH_PROG('re2c')) {
        ERROR('re2c is required')
 }
-DEFINE('RE2C_FLAGS', null);
+DEFINE('RE2C_FLAGS', '');
 PATH_PROG('zip');
 PATH_PROG('lemon');