gnats/54: gnats installed itself with MAIL_AGENT set to "false"!

[sam]

>Number:         54
>Category:       gnats
>Synopsis:       gnats installed itself with MAIL_AGENT set to "false"!
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 18 11:04:00 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     address@hidden
>Release:        3.113
>Organization:
>Environment:
Linux Redhat 5.2
>Description:
I installed GNATS on a system without sendmail installed.
I realize this was pretty foolish, but after I installed
sendmail GNATS still wouldn't work.  I finally realized
that GNATS had chosen "false" for MAIL_AGENT!

This causes send-pr to emit the disturbing error "mysterious
mail failure".  Only by greping send-pr did I eventually
realize the cause.
>How-To-Repeat:
Install GNATS on a system without sendmail.
>Fix:
GNATS installation should fail rather than set MAIL_AGENT
to "false".  As far as I can tell GNATS needs a real
MAIL_AGENT to function.
>Release-Note:
>Audit-Trail:
>Unformatted: