Hello!

> I tried rebuilding top since I'm using the UVM option, and it builds fine,
> but still fails to run.

Did you use the pkg system?

> any idea how I can fix this?

add "UVM=1" to /etc/mk.conf
cd /usr/pkgsrc/sysutils/top
make
make install

If this does not work, please send-pr.

Greets
-- 

   Name  : Thorsten Frueauf            Milano@irc cri@onaliM       //
   E-Mail: s_frueau@ira.uka.de oder ukfy@rz.uni-karlsruhe.de     \X/