Add `Rakefile` to `build/presym` dependency.
MODIFY
Rakefile
Rakefile
@@ -145,7 +145,7 @@ op_table = {
"~" => "neg",
}
-file presym_file => cfiles+rbfiles do
+file presym_file => cfiles+rbfiles+[__FILE__] do
csymbols = cfiles.map do |f|
src = File.read(f)
[src.scan(/intern_lit\([^\n"]*"([^\n "]*)"/),

Add `Rakefile` to `build/presym` dependency.