pkg question upgrade question

[doug]

I added tigervnc to a 10.0-RELEASE-p12 system. Without warning libpng15.so.15 
was removed which effectively means upon the next reboot xfce will not run. 
Sorta disappointing as it is like the pkg_add days. But the only question I have 
is where can one find libpng15.so.15?

I have all the iso images and can easily build a 10.0 system but I would rather 
just pick up the missing module if possible. According to pkg info no installed 
packages require libpng15.so.15. The executables know better