Link to local FDK?
Preferences / Misc allows to uncheck "Use embedded FDK for font".
But how do I point Robofont to another (local) FDK?
you have multiple FDK on your local machine?
RoboFont will use the FDK that is responding when you type "makeotf" in terminal
Yes, different versions installed. So, is it possible to link to another version of FDK?
mmm no, RoboFont only talks to the FDK which is set as default. The FDK that responds to "makeotf" in Terminal.
Is there a reason why you want to use an older version of the FDK?
“The reason is not clear”
What does the checkbox than actually do? Or is it a future feature?
if its enabled it will use the embedded FDK, if not RoboFonts tries to use the the local installed FDK, if you dont have a FDK installed you are not able to generate binaries.
If you want to check if FDK is installed type "which makeotf" in your Terminal. This should return some similar like "/Users/<userName>/bin/FDK/Tools/osx/makeotf"