make: "/usr/ports/mail/postfix/Makefile" line 92: warning: Couldn't read shell's output ...

[Mark Johnston]

On Sun, May 26, 2013 at 08:39:36PM -0400, Michael Butler wrote:
> What's up with this?
> 
> imb at toshi:/home/imb> sudo portupgrade -aR
> make: "/usr/ports/mail/postfix/Makefile" line 92: warning: Couldn't read
> shell's output for "/usr/bin/grep -m 1 '^purgestat'
> /etc/mail/mailer.conf || true"

I've been seeing this in a few other places. It looks like bmake prints
this warning when the shell command in a '!=' assignment doesn't print
anything to stdout. For instance, the line below will trigger a warning
with bmake:

FOO!=/usr/bin/true

-Mark