Make ant optional, for grammar edits only

INSTALL.md

diff --git a/INSTALL.md b/INSTALL.md
index 5b491ff..74107fd 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -13,12 +13,12 @@
 
 * Please install the following package updates:
 
-   * sudo apt-get install build-essential pkg-config ant tcsh swig google-perftools python3 python3-dev
+   * sudo apt-get install build-essential pkg-config tcsh swig google-perftools python3 python3-dev
 
    * If you don't intent to change the grammar:
      * sudo apt-get install default-jre 
    * If you do intent to change the grammar:
-     * sudo apt-get install default-jdk
+     * sudo apt-get install default-jdk ant
 
 * Surelog Source code
   * git clone https://github.com/alainmarcel/Surelog.git

src/buildrelease.sh

diff --git a/src/buildrelease.sh b/src/buildrelease.sh
index 55d1d10..7e8bd6f 100755
--- a/src/buildrelease.sh
+++ b/src/buildrelease.sh
@@ -19,7 +19,7 @@
 
 echo "Generating Antlr parser"
 cd ../grammar
-ant compile_cpp
+java -cp ../antlr4/antlr4-4.7.2/tool/target/antlr4-4.7.2-complete.jar org.antlr.v4.Tool -Dlanguage=Cpp *.g4
 cd ../src
 
 echo "Generating caching scheme"