Solved Firmware

I'm in a bit of a jam (no pun intended). I just got around to installing an E3D Titan extruder on my Robo3D R1+. I would now like to modify the firmware to calibrate for the new gearing. I am using Arduino IDE v1.8.2 and the ROBO3DR1PLUSV2 file from the ROBO wiki. I have used this (I think) in the past to make PID calibrations. I say "I think" because the harddrive on the laptop I use for this died a horrible death and had to be replaced. I believe I'm using the same versions of the software I used in the past. Now, when I compile the sketch fresh out of the box I get the error:
"using typedef-name 'fpos_t' after 'struct'"
I think the problem is with the compiler but I'm less than sure. Any suggestions? TIA!