The make command failed with dependency on slirp module.
The download from Fabrice's website included slirp and the make ran to completion.
My real unsolved issue is that I don't understand how to create a version of Plan9 that
boots and runs on tinyemu. I confirmed that tinyemu itself runs fine because I have
a version of Linux (via Buildroot?) running on tinyemu.
Alternatively an image that could be loaded with tinyemu configuration would be useful.
That is, having files to specify with the bios and kernel parameters in the configuration file.
The only notes on booting Plan9 that I could find are all for PC hardware.
Maybe I'm not looking in the right places.