- be more strict about the spelling of --clean

diff --git a/build b/build
index f0dac93..67368e1 100755 (executable)
--- a/build
+++ b/build
@@ -841,7 +841,7 @@ while test -n "$1"; do
       *-no*checks)
        DO_CHECKS=false
       ;;
-      *-clean)
+      -clean|--clean)
        CLEAN_BUILD='--clean'
       ;;
       *-kill)