From 4bc2a390c6db740d3e9972ec4f2fb092222707f9 Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@z.cash>
Date: Fri, 25 Mar 2016 16:43:28 +1300
Subject: [PATCH] Require java for --with-comparison-tool

---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 6c8ca8869..23e3a3603 100644
--- a/configure.ac
+++ b/configure.ac
@@ -323,6 +323,9 @@ case $host in
 esac
 
 if test x$use_comparison_tool != xno; then
+  if test x$JAVA = x; then
+    AC_MSG_ERROR("comparison tool set but java not found")
+  fi
   AC_SUBST(JAVA_COMPARISON_TOOL, $use_comparison_tool)
 fi