configure: error: could not find bash >= 3.1

[ZweiEuro]

I run GNU bash, version 5.0

The Error is very self explanatory, but not logical
In order to fix this:
vim ./crosstool-NG/configure.ac
and on line 193 change
|$EGREP '^GNU bash, version (3.[1-9]|4)')
to something more sensible like:
|$EGREP '^GNU bash, version (3.[1-9]|4|5)')

This cost me way too much time to find, no idea why u are not allowing bash 5 but it compiles and works perfectly fine.