compilation on solaris2.8

Hi,

I dunno to who reports this, but to compile the postgres7.4.2, I've
added the following lines :
--extern char *rl_filename_completion_function (const char *, int);
which came from the readlines.h
in :
--./bin/psql/tab-complete.c
to compile it on solaris2.8

I know that this quite dirty and that It should better to include de
readlines correctly

Regards

Cédric BRINER