Source: glibc Followup-For: Bug #1079443 X-Debbugs-Cc: tj.iam...@proton.me This seems to confirm the cause:
debvm$ sudo chroot debvm.fs apt-get install libc6-dev debvm$ grep -rn 'define .*TIMESIZE' debvm.fs/usr/include debvm.fs/usr/include/arm-linux-gnueabihf/bits/timesize.h:20:#define __TIMESIZE 32