Custombuild does need gmake, but will attempt to install it with dpkg -r or ports if it's missing. If necessary: 5. Now, enter Y and push Enter to produce the gcloud CLI available in your command prompt windows. Or input N and push Enter to work with this tool only https://directadmin-install90000.ssnblog.com/25884239/5-essential-elements-for-magento-2-migration