--- rstudio-0.99.879-orig/src/gwt/build.xml	2016-02-12 09:24:39.000000000 +1100
+++ rstudio-0.99.879/src/gwt/build.xml	2016-02-20 00:25:39.458756693 +1100
@@ -25,6 +25,7 @@
    <property name="gwt.extra.args" value=""/>
    <property name="gwt.main.module" value="org.rstudio.studio.RStudio"/>
    <property name="ace.bin" value="src/org/rstudio/studio/client/workbench/views/source/editors/text/ace"/>
+   <property environment="env"/>
 
    <path id="project.class.path">
       <pathelement location="bin"/>
@@ -101,8 +102,10 @@
             <pathelement location="src"/>
             <path refid="project.class.path"/>
          </classpath>
+         <jvmarg value="-Duser.home=${env.T}"/>
          <!-- add jvmarg -Xss16M or similar if you see a StackOverflowError -->
          <jvmarg value="-Xmx1536M"/>
+         <jvmarg value="-Djava.util.prefs.userRoot=${env.T}"/>
          <arg value="-war"/>
          <arg value="www"/>
          <arg value="-localWorkers"/>
@@ -142,6 +145,7 @@
             <pathelement location="src"/>
             <path refid="project.class.path"/>
          </classpath>
+         <jvmarg value="-Duser.home=${env.T}"/>
          <jvmarg value="-Xmx2048M"/>
          <arg value="-war"/>
          <arg value="www"/>
@@ -163,6 +167,7 @@
             <pathelement location="src"/>
             <path refid="project.class.path"/>
          </classpath>
+         <jvmarg value="-Duser.home=${env.T}"/>
          <jvmarg value="-Xmx2048M"/>
       	<arg value="-src"/>
       	<arg value = "src"/>
@@ -194,6 +199,7 @@
                   <pathelement location="src"/>
                   <path refid="test.class.path"/>
                </classpath>
+               <jvmarg value="-Duser.home=${env.T}"/>
                <arg value="org.rstudio.studio.selenium.RStudioTestSuite"/>
             </java>
          </sequential>