--- a/tool_dependencies.xml	Mon Jun 16 10:50:20 2014 -0400
+++ b/tool_dependencies.xml	Mon Jun 16 10:58:10 2014 -0400
@@ -3,7 +3,7 @@
     <set_environment version="1.0">
         <environment_variable action="set_to" name="SCRIPT_PATH">$REPOSITORY_INSTALL_DIR</environment_variable>
     </set_environment>
-    <package name="R" version="3.0.3">
+    <package name="R" version="3.0.3" prior_installation_required="True">
         <repository changeset_revision="933ba62d2f11" name="package_r_3_0_3" owner="iuc" toolshed="http://toolshed.g2.bx.psu.edu" />
     </package>
     <package name="charts_r_packages" version="1.0">
@@ -11,7 +11,7 @@
             <actions>
                 <action type="setup_r_environment">
                     <repository changeset_revision="933ba62d2f11" name="package_r_3_0_3" owner="iuc" toolshed="http://toolshed.g2.bx.psu.edu">
-                        <package name="R" version="3.0.3" />
+                        <package name="R" version="3.0.3" prior_installation_required="True"/>
                     </repository>
                     <package>http://cran.r-project.org/src/contrib/getopt_1.20.0.tar.gz</package>
                     <package>http://cran.r-project.org/src/contrib/Matrix_1.1-4.tar.gz</package>