try to set jvm.args to fix builds
diff --git a/build.properties b/build.properties
new file mode 100644
index 0000000..0441d4a
--- /dev/null
+++ b/build.properties
@@ -0,0 +1,37 @@
+################################################################################
+##
+## Licensed to the Apache Software Foundation (ASF) under one or more
+## contributor license agreements. See the NOTICE file distributed with
+## this work for additional information regarding copyright ownership.
+## The ASF licenses this file to You under the Apache License, Version 2.0
+## (the "License"); you may not use this file except in compliance with
+## the License. You may obtain a copy of the License at
+##
+## http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+################################################################################
+
+# For Java 7 on Mac OS X, you need an Intel-based Mac running Mac OS X version 10.7.3
+# (Lion) and above. Only the 64-bit data model is available so leave this blank.
+# Since ant properties are immutable, if this property is set in the build file before
+# this file is included, setting it to nothing here is a no-op.
+local.d32 =
+
+src.depend = true
+src.debug = on
+
+# JVM options for <compc> and <mxmlc> tasks
+jvm.args = ${local.d32} -Xms64m -Xmx512m -ea -Dapple.awt.UIElement=true
+ # -d32/-d64 for 32-bit/64-bit code model (or don't specify for the default)
+ # -Xms64m: start out with a 64 MB heap
+ # -Xmx512m: allow the heap to grow to 512 MB
+ # -ea: enable Java assertions
+compc.jvm.args = ${jvm.args}
+mxmlc.jvm.args = ${jvm.args}
+
