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Raspberry Pi

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    "I think that's the 32-bit version." uname tell you the architecture of the kernel. That actually isn't what is important, except that to run a 64-bit userland you need a 64-bit kernel -- but running a 64-bit kernel doesn't make it so, because you can also run a 32-bit userland that way. Which is what the stock Raspbian/RpiOS is; 32-bit, although on some models it loads a 64-bit kernel by default. To build or use 64-bit software, you need a 64-bit kernel and a 64-bit userland. Commented Aug 26, 2021 at 13:52
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    "I must have installed the 64-bit version earlier which led to the problem. I still don't understand why it happened though and how I could build a 64-bit version of Ruby on that system configuration." -> Perhaps you typo'd 64 and 32 backward here but again: To build 64-bit software you need a 64-bit userland. It is not possible otherwise. Commented Aug 26, 2021 at 13:54
  • I’ll go back and try to install a 64 bit version of kernel and userland. Commented Aug 27, 2021 at 11:52
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    I had the same problem: 64 bits kernel loaded on a 32 bits userland. Checking my /boot/config.txt configuration I had the arm_64bit=1 option. By commenting it, I was able to reboot under a 32 bits kernel and the compilation went well. Commented Sep 13, 2022 at 13:44