--- rstudio-1.2.1335-orig/src/gwt/build.xml	2019-03-28 16:08:20.000000000 +1100
+++ rstudio-1.2.1335/src/gwt/build.xml	2019-04-09 16:44:15.089471934 +1000
@@ -34,6 +34,7 @@
    <property name="gwt.extra.args" value=""/>
    <property name="gwt.main.module" value="org.rstudio.studio.RStudio"/>
    <property name="ace.bin" value="${src.dir}/org/rstudio/studio/client/workbench/views/source/editors/text/ace"/>
+   <property environment="env"/>
 
    <path id="project.class.path">
      <pathelement location="${build.dir}"/>
@@ -112,8 +113,10 @@
             <pathelement location="${src.dir}"/>
             <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="${www.dir}"/>
          <arg value="-localWorkers"/>
@@ -154,6 +157,7 @@
             <pathelement location="${src.dir}"/>
             <path refid="project.class.path"/>
          </classpath>
+         <jvmarg value="-Duser.home=${env.T}"/>
          <jvmarg value="-Xmx2048M"/>
          <arg value="-style"/>
          <arg value="PRETTY"/>
@@ -176,6 +180,7 @@
             <pathelement location="src"/>
             <path refid="project.class.path"/>
          </classpath>
+         <jvmarg value="-Duser.home=${env.T}"/>
          <jvmarg value="-Xmx2048M"/>
          <arg value="-style"/>
          <arg value="PRETTY"/>
@@ -202,6 +207,7 @@
             <pathelement location="src"/>
             <path refid="project.class.path"/>
          </classpath>
+         <jvmarg value="-Duser.home=${env.T}"/>
          <jvmarg value="-Xmx2048M"/>
       	<arg value="-src"/>
       	<arg value = "src"/>
@@ -237,6 +243,7 @@
             <pathelement location="${test.dir}"/>
             <pathelement location="${src.dir}"/>
         </classpath>
+        <jvmarg value="-Duser.home=${env.T}"/>
         <classpath refid="project.class.path"/>
         <classpath refid="unittest.class.path"/>
         <arg value="org.rstudio.studio.client.RStudioUnitTestSuite"/>