Hmm, that’s weird. I assume you’ve added the right code to panda/metalibs/pandagles2 and panda/metalibs/pandagles already?
Maybe you’re accidentally including pandagles2.h in your code, or so?
If not, you could try calling “make cleanall” within the wegldisplay and pandagles2 directories, and invoking “ppremake” and “make install” in wegldisplay and pandagles2, respectively.