Just upgraded and arp-scan no longer works.  Looking at dependencies I found it was libpcap.
This is on a Dockstar.  It still works on a  x86_64.
$this->bbcode_second_pass_code('', 'upgraded libpcap (1.4.0-1 -> 1.5.1-1)
arp-scan -l
ioctl: No such device
Running 'pacman -U libpcap-1.4.0-1-arm.pkg.tar.xz'
downgraded libpcap (1.5.1-1 -> 1.4.0-1)
arp-scan -l
Interface: eth0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.9 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/)
...
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