diff --git a/.gitignore b/.gitignore
index 1ab08e6f..8553e0ef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ build
 .gradle
 out
 classes
+*~
diff --git a/build.gradle b/build.gradle
index 789d42d5..652e6041 100644
--- a/build.gradle
+++ b/build.gradle
@@ -70,7 +70,7 @@ test {
 
 task enforceVersion << {
     def foundVersion = JavaVersion.current();
-    if (foundVersion != javaVersion)
+    if (foundVersion < javaVersion)
         throw new IllegalStateException("Wrong java version; required is " +
             javaVersion + ", but found " + foundVersion);
 }
diff --git a/gradlew.bat b/gradlew.bat
old mode 100644
new mode 100755