The documentation (on-line and otherwise) indicates that __djgpp_share_flags
should work with fopen and that an extern should appear in fcntl.h.  These
files, however, have to reference to this variable.

There are other ways to open the file for sharing but I wanted to use ANSI
file functions.  I can always cheat by filling in a file structure myself.

I found that I wasn't using the latest version of fcntl.h.  The latest one
does have an extern for the flags.  The source I download for fopen.c, however
still doesn't show usage of the flags.

The source for `fopen' indeed doesn't use the variable directly, but
that's not a bug: the share flags are used by `open' which is called
by `fopen'.

This works in v2.02.  It was never a bug in the first place: the user
simply had a stale version of fcntl.h.