Comment 1 for bug 501286

I don't get this error on a fresh checkout.

The line is:
$(_DOC_OMF_DB) : $(_DOC_OMF_IN)

And the make manual says:
`missing target pattern. Stop.'
`multiple target patterns. Stop.'
`target pattern contains no `%'. Stop.'
    These are generated for malformed static pattern rules. The first means there's no pattern in the target section of the rule, the second means there are multiple patterns in the target section, and the third means the target doesn't contain a pattern character (%).

But I'm not quite sure why it would be different for you vs me. Do you have gnome-doc-utils installed? Do you have po4a installed?