$OpenBSD$
--- build/data.mk.orig	Wed Apr 27 15:08:32 2011
+++ build/data.mk	Wed Apr 27 15:09:40 2011
@@ -20,7 +20,7 @@ ZIP_DEL_OPTS = d -tzip
 # bonus points if you can get this to work using 7za
 ZIP_LIST =
 else
-FIND = find $(addprefix $(BASE_DIR)/,$(1)) -type f -print
+FIND = test -d $(addprefix $(BASE_DIR)/,$(1)) && find $(addprefix $(BASE_DIR)/,$(1)) -type f -print
 ZIP = 7za
 ZIP_UP_OPTS = a -tzip -mx=9
 ZIP_DEL_OPTS = d -tzip