initdb must have write access to /tmp

Hi,

    I was just installing postgres 7.1.2 on my linux mandrake 7.2
    system and the build and install went fine up to the point I
    had to run:

     initdb -D /usr/local/pgsql/data

    which segfaulted.  I changed the permissions on /tmp to 777
    and all was well.  I think initdb could use an if statement to
    check the permissions on /tmp and report a descriptive bug.

-Rich

Rich Bodo | rsb@ostel.com | 650-964-4678