ld-elf, libkvm out of sync, can't build ports

[knowtree at aloha.com]

Running 4.9 STABLE, fresh cvsup of src and ports. Kernel builds and
installs fine, but none of my ports will build. gkrellm and postgresql,
just to name a couple.

Linking stops with error message:

/usr/libexec/ld-elf.so.1: /usr/lib/libkvm.so.2: Undefined symbol "__stderrp"

It looks as if I need to update or rebuild libkvm, but I can't find
anything that explains how.

How can I fix this?

Gary Dunn
Open Slate Project