Hi Den Bigh ,
The example code you are referring is really very old, please go to this link download the newest SDK2.x for your FRDM-KL03 board:
Welcome | MCUXpresso SDK Builder
After you download the SDK code, you can find some document will tell you how to run the code in GCC, please check this SDK folder:
SDK_2.3.1_FRDM-KL03Z\docs
If you still have questions about it, please kinldy let me know.
Wish it helps you!
Have a great day,
Kerry
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