OpenAL issue with ofxTimeline in 0.9.8

On OSX 10.12, using oF 0.9.8 (probably not a great idea, I know) I’m getting this error in ofxTimeline’s ofOpenALSoundPlayer_TimelineAdditions.h:

Non-virtual member function marked ‘override’ hides virtual member function

for the line:

bool load(string fileName, bool stream = false) override;

If I remove “override” I get a bunch of Apple Mach-O Linker (ld) Errors

Any ideas on what could be wrong?