I kept hitting the same two errors on builds that worked a minute earlier:

version `GLIBC_2.34' not found version `GLIBCXX_3.4.29' not found

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The advice everywhere is "copy the library from the machine where it works". I tried

it properly, with a real build, and it fails one layer deeper than you expect. That

sent me looking for an actual table of what each distribution ships — and none

existed, so I measured one.

What I measured

For each release: ldd --version for glibc, and the highest GLIBCXX_* symbol

version inside libstdc++.so.6 . Every row came out of the official image, not from

memory.…