streamline build scripts
diff --git a/releng.wtpbuilder/scripts/build/runbuild.xml b/releng.wtpbuilder/scripts/build/runbuild.xml
index d579c38..0eb96df 100644
--- a/releng.wtpbuilder/scripts/build/runbuild.xml
+++ b/releng.wtpbuilder/scripts/build/runbuild.xml
@@ -177,7 +177,7 @@
             be unstable, so we'll fail if we forgot to specify it -->
         <fail unless="eclipse.builder.version" />
         <mkdir
-            dir="${env.BASE_BUILDERS/${eclipse.builder.version}" />
+            dir="${env.BASE_BUILDERS}/${eclipse.builder.version}" />
         <cvs
             quiet="${env.CVS_QUIET}"
             reallyquiet="${env.CVS_REALLY_QUIET}"