Success!
Thanks again, AmatCoder, for all your help and tinypoodle for the tip. (Note: I ended up having to install both nvidia-glx-dev.tcz and nvidia-glx.tcz. Without nvidia-glx.tcz I got this error "/usr/bin/ld: cannot find -lGL".)
To help any others reading this, after the compilation process is complete the extension files are placed into /home/tc/tc-ext-tools/storage/.
To save your compiled extension for later use (without having to rebuild it), copy the .tcz, .tcz.dep, and .tcz.md5.txt files. Then for future installs you can copy those files into your /tce/optional/ directory and install the extension using the "Load App Locally" option.
I do have one resulting question about dependencies: When installing locally, is there any way to have the dependencies download automatically?
In my searching I was unable to find much info on installing locally at all. For example, is there a tce-load command for local extensions?
Again, thanks for any help and/or points in the right direction.
fodder