diff --git a/com.ibm.wala.core.testdata/.externalToolBuilders/Extra Bundled Jars Builder.launch b/com.ibm.wala.core.testdata/.externalToolBuilders/Extra Bundled Jars Builder.launch
new file mode 100644
index 000000000..5c90dd464
--- /dev/null
+++ b/com.ibm.wala.core.testdata/.externalToolBuilders/Extra Bundled Jars Builder.launch	
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<launchConfiguration type="org.eclipse.ui.externaltools.ProgramBuilderLaunchConfigurationType">
+<stringAttribute key="org.eclipse.debug.core.ATTR_REFRESH_SCOPE" value="${project}"/>
+<booleanAttribute key="org.eclipse.debug.core.capture_output" value="false"/>
+<booleanAttribute key="org.eclipse.debug.ui.ATTR_CONSOLE_OUTPUT_ON" value="false"/>
+<booleanAttribute key="org.eclipse.debug.ui.ATTR_LAUNCH_IN_BACKGROUND" value="false"/>
+<stringAttribute key="org.eclipse.ui.externaltools.ATTR_LOCATION" value="${workspace_loc:/com.ibm.wala.core.testdata}/../gradlew"/>
+<stringAttribute key="org.eclipse.ui.externaltools.ATTR_RUN_BUILD_KINDS" value="incremental,auto,"/>
+<stringAttribute key="org.eclipse.ui.externaltools.ATTR_TOOL_ARGUMENTS" value="collectJLex&#10;collectTestData&#10;collectTestDataA&#10;extractBcel&#10;generateHelloHash&#10;verifyJavaCup"/>
+<booleanAttribute key="org.eclipse.ui.externaltools.ATTR_TRIGGERS_CONFIGURED" value="true"/>
+<stringAttribute key="org.eclipse.ui.externaltools.ATTR_WORKING_DIRECTORY" value="${workspace_loc:/com.ibm.wala.core.testdata}"/>
+</launchConfiguration>
diff --git a/com.ibm.wala.core.testdata/build.gradle b/com.ibm.wala.core.testdata/build.gradle
index 145769c7e..24828ec76 100644
--- a/com.ibm.wala.core.testdata/build.gradle
+++ b/com.ibm.wala.core.testdata/build.gradle
@@ -172,3 +172,14 @@ task collectTestDataA(type: Jar) {
 task cleanColllectTestDataA(type: Delete) {
 	delete collectTestDataA
 }
+
+
+////////////////////////////////////////////////////////////////////////
+//
+//  help Eclipse build these extra jars when needed
+//
+
+eclipse.project {
+	buildCommand 'org.eclipse.ui.externaltools.ExternalToolBuilder', LaunchConfigHandle: '<project>/.externalToolBuilders/Extra Bundled Jars Builder.launch', incclean: 'true'
+	// TODO: buildCommand XML element should have "<triggers>auto,full,incremental,</triggers>" child
+}