Error compiling with Adafruit GFX library

I have this LED panel I got working with a Teensy2++ and a version of the Adafruit_GFX library.

The variations on the GFX library are here:
https://github.com/okyeron/ElementTeensyGFX

I am getting this error trying to complile

element_teensy3_gfx2.cpp.o: In function `Adafruit_GFX':
Adafruit_GFX.h:28: undefined reference to `vtable for Adafruit_GFX'
collect2: ld returned 1 exit status


any help?
 
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