Releng: use previous SDK for installing the previous compiler into
diff --git a/releng/build-scripts/build/otdt_runtests-hipp.sh b/releng/build-scripts/build/otdt_runtests-hipp.sh
index 1751103..3622e13 100755
--- a/releng/build-scripts/build/otdt_runtests-hipp.sh
+++ b/releng/build-scripts/build/otdt_runtests-hipp.sh
@@ -19,6 +19,7 @@
 # OT_TESTSUITE_DIR      root directory for building and testing
 # METADATA				directory for metadata from previous builds
 # SDK_QUALIFIER			build qualifier of the base eclipse SDK
+# ECLIPSE_BOOT_TGZ      archive file of the boot eclipse SDK build (full path)
 # ECLIPSE_SDK_TGZ       archive file of the base eclipse SDK build (full path)
 # ECLIPSE_TESTLIB_ZIP   archive file of the eclipse test framework (full path)
 # PUBLISHED_UPDATES 	directory of previously published plugins&features
@@ -34,6 +35,7 @@
 ## As Ant Arguments (from ANT_PROFILE):
 ##      -verbose                configure Ant
 ## As Java Properties:
+##      -Declipse-bot.tgz       path of boot eclipse SDK
 ##      -Declipse-app.tgz       path of eclipse SDK
 ##      -Declipse.tests.zip     path of eclipse test framework
 ##		-Dpublished.updates		path to previously published things
diff --git a/releng/build-scripts/build/run.properties b/releng/build-scripts/build/run.properties
index 479b6f2..2adac1f 100644
--- a/releng/build-scripts/build/run.properties
+++ b/releng/build-scripts/build/run.properties
@@ -18,8 +18,8 @@
 # Version dependent names:
 
 # ------------- insert current versions here ---------------
-# Details of the Eclipse SDK built upon:
-run.eclipseScriptDir=plugins/org.eclipse.pde.build_3.10.400.v20190320-1020/scripts
+# Details of the boot Eclipse SDK:
+run.eclipseScriptDir=plugins/org.eclipse.pde.build_3.10.300.v20190305-0856/scripts
 org.eclipse.equinox.launcher_jar=org.eclipse.equinox.launcher_1.5.300.v20190213-1655.jar
 
 # for patching our patch feature to match this version with any suffix: