Meson: Missing config-host.mak

Wanted to give a try to the new build system, but a simple "meson build" gives that error:

meson.build:15:0: ERROR: Failed to load /home/xclaesse/programmation/qemu/build/config-host.mak: [Errno 2] No such file or directory: '/home/xclaesse/programmation/qemu/build/config-host.mak'