- If USE_PERLIO is _NOT_ set
- then USE_STDIO above will be set to be conservative.
- If USE_PERLIO is set
- then there are two modes determined by USE_SFIO:
-
- USE_SFIO - If set causes PerlIO_xxx() to be #define-d onto sfio functions.
- A backward compatability mode for some specialist applications.
-
- If USE_SFIO is not set then PerlIO_xxx() are real functions