Releng: use previous SDK for installing the previous compiler into
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: