The “compile in an old version” thing was IIRC more properly done with linker scripts telling the linker to use an older symbol. I think lsb-gcc does it for you

The “compile in an old version” thing was IIRC more properly done with linker scripts telling the linker to use an older symbol. I think lsb-gcc does it for you — not that the Linux Standard Base is still widely respected at all.