How to disable --check-compatibility when building a VF?

The help string says this:
```
--check-compatibility
Check if the source files are interpolatable. It is
disabled by default, but enabled when building
variable fonts or what the 'Enforce Compatibility
Check' custom parameter is set on a Glyphs file
```

From that I deduce that I can't disable the check when building a VF. This is unfortunate for our very big VF build, where we only want to use the option when debugging problems. Or do I miss something?