Comment 6 for bug 310779

I still don't know, why this change is neccessary:
    - Add --install to the libtoolize call in debian/rules so that all the
      necessary files get installed.

On Debian it builds just fine:
http://buildd.debian.org/fetch.cgi?&pkg=unbound&ver=1.0.2-1.2&arch=i386&stamp=1229426642&file=log

Ondrej.