Illegal instruction....

[David J Taylor]

Having now got gpsd 3.20 installed and working on my Raspberry Pi 1B (with 
thanks to Gary and several others for their help) I thought I would be ably 
simply to compile and run my monitoring software:

 https://www.satsignal.eu/raspberry-pi/monitoring.html#gps

However, although the program compiles and runs on a Raspberry Pi 4B, on the 
Raspberry Pi 1B it just says "Illegal instruction".  We still don't know 
/why/ there was problem with 3.20 from the backports not working, but I'd 
wondered about the ARM level.  I tried a number of ARM versions but still 
got the illegal instruction.

Inexperienced as I am, I don't know how to proceed, or what the issue is 
likely to be.  cgps and ubxtool both work exactly as expected.

Suggestions welcomed.

Thanks,
David
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