/Library/Developer/CommandLineTools. If not present, CLT isn't installed anyway.
PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/libexec"; export PATH; m4 --version
GNU M4 1.4.6 Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.Written by Rene' Seindal.
Enable system extensions.
Startup Security Utility
Allow user management of kernel extensions from identified developers
Open security Preferences. If this doesn't happen, open Canister which will tell you to
Allow driver in system settingsand trigger macOS into showing the much-coveted
Allow. You'll need to reboot once more, and then you're done.
sudo /usr/bin/kmutil load -p /Library/Extensions/ATTOExpressSASHBA2.kext
sudo kextload /Library/Extensions/ATTOExpressSASHBA2.kext
sudo /usr/bin/kmutil load -p /Library/Filesystems/macfuse.fs/Contents/Extensions/11/macfuse.kext
system policy prevents loadingand/or doesn't load macFUSE, your computer is very likely under IT management policies that prevent kernel extensions to load. Talk to your IT department first, they'll know what to do.