ext/util/make_ext Used by Makefile to execute extension Makefiles
ext/util/mkbootstrap Turns ext/*/*_BS into bootstrap info
fakethr.h Fake threads header
+fakesdio.h stdio in terms of PerlIO
form.h Public declarations for the above
global.sym Symbols that need hiding when embedded
globals.c File to declare global symbols (for shared library)
perlapi.c Perl API functions
perlapi.h Perl API function declarations
perlio.c C code for PerlIO abstraction
-perlio.h compatibility stub
+perlio.h PerlIO abstraction
+perliol.h PerlIO Layer definition
perlio.sym Symbols for PerlIO abstraction
perlsdio.h Fake stdio using perlio
perlsfio.h Prototype sfio mapping for PerlIO