you're getting this template-based bug because the package in the subject hit a "header present but cannot be compiled" during ./configure execution. If you check my blog post in the URL, this is going to be a problem when autoconf-2.64 will be used so you should pay attention and consider fixing the issue (or let upstream know about it at least).
Thank you for your consideration. Share and enjoy!
net-mail/lbdb-0.36:20081121-202714.log:configure: WARNING: vf_iface.h: present but cannot be compiled
Thanks for the bugreport:
I wasn't aware that libvformat is in the tree at all. So I have to fix lbdb.
The bug itself looks like a bug in libvformat:
Should be fixed in version 1.13-r1.
The only difference is the used Debian patch (1.13-r1 use the 4th revision of the Debian patch while the old ebuild use the 3rd revision of the patch).