fix logic of null check
diff --git a/releng.control/cc.sh b/releng.control/cc.sh
index b02013a..4ce09af 100644
--- a/releng.control/cc.sh
+++ b/releng.control/cc.sh
@@ -3,7 +3,7 @@
 # remember to leave no slashes on filename in source command,
 # (the commonVariations.shsource file, that is)
 # so that users path is used to find it (first)
-if [ -n $BUILD_INITIALIZED ]
+if [ -z $BUILD_INITIALIZED ]
 then
    source commonVariations.shsource
    source ${RELENG_CONTROL}/commonComputedVariables.shsource