I know it is due to the fact this library isn't really an actual Arduino library but it's a bit anoying to see this warning every time you startup the IDE :-) After some testing it seems that adding ...

Git rev: 7b4814f Can't compile any of the examples due to missing header file. Arduino: 1.8.9 (Linux), Board: "SparkFun Pro nRF52840 Mini, s140 6.1.1 r0, Level 0 (Release)" In file in... Skip to ...

[Chris Hulbert] is making it easy for Arduino users to program MSP430 chips with a header file that allows you to compile Arduino sketches for the Launchpad. This makes sense, as the growing number… ...