I looks like the solution to my problem was to delete the slirp folder, then do a 'git pull', then make QEMU again. Networking is working again.
** Changed in: qemu Status: Incomplete => Fix Released -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1917161 Title: Parameter 'type' expects a netdev backend type Status in QEMU: Fix Released Bug description: When using QEMU on an M1 Mac with Mac OS 11.1, I see this error message when trying to enable networking for a guest: Parameter 'type' expects a netdev backend type Example command: qemu-system-i386 -m 700 -hda <Windows XP HD file> -netdev user,id=n0 -device rtl8139,netdev=n0 What should happen is networking should work when issuing the above command. What actually happens is QEMU exits immediately. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1917161/+subscriptions