Not sure if general or distro-specific, on Exherbo we install arping to /usr/sbin so NetworkManager fails to find it with the following warning in journal:

MESSAGE : <warn> Could not send ARP for local address 10.132.159.86: Failed to execute child process "/sbin/arping" (No such file or directory)

Is there any specific reason the path to arping and the other tools are hardcoded in the first place? And if yes could you add an additional search path like it is already in place for other tools, e.g. dhcpcd:

static const char *dhcpcd_paths[] = {
	"/sbin/dhcpcd",
	"/usr/sbin/dhcpcd",
	"/usr/pkg/sbin/dhcpcd",
	"/usr/local/sbin/dhcpcd",
	NULL
};