diff --git a/Tupfile b/Tupfile
index 03b6681..a9528a8 100644
--- a/Tupfile
+++ b/Tupfile
@@ -1,9 +1,14 @@
+.gitignore
 include_rules
 
 ifndef SCULPT_VERSION
 error CONFIG_SCULPT_VERSION is undefined
 endif
 
+ifndef PUBLIC_USER
+error CONFIG_PUBLIC_USER is undefined
+endif
+
 SHORT_SUM = b2sum -l24
 
 : $(DEPOT_DIR)/<raw-archives> $(DEPOT_DIR)/<bin-archives> |> \
@@ -13,6 +18,7 @@ SHORT_SUM = b2sum -l24
 	# Generate a listing of all raw archives
 
 : $(DEPOT_DIR)/<raw-archives> |> \
+	touch %o; \
 	for f in %<raw-archives>; do cat $f >> %o; done; \
 |> $(RAW_LISTING)
 	# Generate a listing of all raw archives
diff --git a/nim/Tuprules.tup b/nim/Tuprules.tup
index 806191b..6a92c14 100644
--- a/nim/Tuprules.tup
+++ b/nim/Tuprules.tup
@@ -1,3 +1,5 @@
+# Nim default variables
+
 NIM_RELEASE_FLAG = -d:release
 	# Drop the relase flag with the line "NIM_RELEASE_FLAG="