Compiler suddenly can't see .h files

Development Tools IDE 1.x
1

This is on a 2011 iMac 27", running High Sierra (10.13.6, the latest it can take).

Arduino IDE 10.13.6

(next week, the adaptor arrives so that I can connect to my new m3 MacBook, but until then . . .)

This board and project ran from about 2019 to 2021, when it was pulled and put aside (a tree fell, breaking the sprinkler setup it controlled).

It was compiling and installing up through a couple of days ago when I started working on it again.

When I came to trim further today, I suddenly started getting the "no header files (.h) found in [...]/Documebnts/Arduino/libraries/ArduinoBLE" errors (also for the low power library.

But I look, and there they are in .../ArduinoBLE/src

This is a sudden onset failure. The last day I worked on it, I was successfully compiling and installing and talking to it over BLE from my phone.

I'm not sure where to even start on this one!

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Start by posting the complete error chain from your most recent failed compile. Put it in quotes, or in code tags, which preserves formatting.

3

Calling @ptillisch for MacOS issue.

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