On 5.9.5+ PL_parser is always available, although not always a define, but a symbol.
-rw-r--r-- Changes
-rw-r--r-- Declare.xs
-rw-r--r-- MANIFEST.SKIP
-rw-r--r-- Makefile.PL
drwxr-xr-x lib
-rw-r--r-- stolen_chunk_of_toke.c
drwxr-xr-x t