* djgpp/config.sed: Add copyright notice, and replace "filesystem"
with "file system".
- Avoid undefined behavior that accessed just before the start of an
+ Avoid undefined behavior that addressed just before the start of an
array. Problem reported by twlevo.
* src/reader.c (packgram): Prepend a new sentinel before ritem.
* src/lalr.c (build_relations): Rely on new sentinel.