Anyone using Max 8 with Owl Modular?

I’m going through the first tutorial and when I just upload the SimpleAtten.cpp and SimpleAtten.h files and try to compile them, I get this.

In file included from /tmp/owl/owl-src-kiNAnW/SimpleAtten.cpp:1:
/tmp/owl/owl-src-kiNAnW/SimpleAtten.h:60:10: fatal error: genlib.h: No such file or directory
60 | #include “genlib.h”
| ^~~~~~~~~~
compilation terminated.
make[1]: *** [ /tmp/owl/owl-build-pQIUXm/SimpleAtten.o] Error 1
make: *** [Makefile:110: patch] Error 2
ERROR: Patch build failed.

If I subsequently include all the files in the gen_dsp folder (which is where that file lives) then I get some other error messages which I slightly doubt are worth pursuing as this is such a simple example and it should work modulo changes in the way Max works. Or maybe the web compiler no longer has the Max header files up there? If Rebel has to maintain a Max license, doesn’t seem like something they’d be doing with the (apparent) level of activity.