automatic setting of $ARCH.
diff --git a/releng/build-scripts/build/otdt_prerequisites.sh b/releng/build-scripts/build/otdt_prerequisites.sh
index f548afe..0232b20 100644
--- a/releng/build-scripts/build/otdt_prerequisites.sh
+++ b/releng/build-scripts/build/otdt_prerequisites.sh
@@ -43,7 +43,7 @@
 # Eclipse SKD build identifier:
 EVERSION=3.6RC1
 # Architecture (as used by OSGi):
-ARCH="-ppc64"
+ARCH=`arch`
 # used only locally:
 DROP=${BASEDIR}/drops/S-3.6RC1-201005131500