For GCC versions < 5, you must add the -d:nimEmulateOverflowChecks switch.
I'm not sure how to do it with buil_all.sh
Adding it to koch directly works well.
./Koch -d:release -d:nimEmulateOverflowChecks boot
Run
> [https://github.com/nim-lang/Nim/pull/13692](https://github.com/nim-lang/Nim/pull/13692)
