marlin/buildroot/bin/opt_set

#!/usr/bin/env bash

SED=$(which gsed || which sed)

eval "${SED} -E -i 's/(\/\/)?(#define \b${1}\b).*$/\2 ${2}/g' Marlin/Configuration.h"
eval "${SED} -E -i 's/(\/\/)?(#define \b${1}\b).*$/\2 ${2}/g' Marlin/Configuration_adv.h"