From fed5196ff3f1a277d02479c53658245f1f9b7ad7 Mon Sep 17 00:00:00 2001
From: Miki Rozloznik <mikulas.rozloznik@eccam.com>
Date: Mon, 9 Dec 2024 15:50:08 +0100
Subject: [PATCH] Small fix for Java 21

---
 compiler/core/build.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/core/build.xml b/compiler/core/build.xml
index 04dddd2e4..36cdde263 100644
--- a/compiler/core/build.xml
+++ b/compiler/core/build.xml
@@ -81,7 +81,7 @@ spotbugs.home_dir       - Location of the spotbugs tool. If not set, spotbugs is
         <attribute name="package" default="zserio.antlr"/>
         <sequential>
             <echo message="Generating ANTLR 4 grammar: @{target}"/>
-            <java classname="org.antlr.v4.Tool" failonerror="true">
+            <java classname="org.antlr.v4.Tool" failonerror="true" fork="true">
                 <classpath>
                     <pathelement location="${3rdparty.jar_dir}/${3rdparty.antlr4.jar_file_name}"/>
                 </classpath>