gdbus-codegen is not found

[mcr]

despite /usr/bin/gdbus-codegen exising, the ./configure did not find it, as it uses pkg_config in some way that I didn't understand.

I had to do:

GDBUS_CODEGEN=/usr/bin/gdbus-codegen ./configure --with-dbuspolicydir=/etc/dbus-1/system.d --with-systemdsystemunitdir=/lib/systemd/system --with-systemdpresetdir=/lib/systemd/system-preset --datarootdir=/usr/share