To be updated for 2.4 (didn't check), this was for previous less good 2.3 version)
* seabios-any
https://www.archlinux.org/packages/extra/any/seabios/
* iasl
* leveldb
* libseccomp

for 2.6, seabios-any is still needed.
I didn't compile numactl, where arm is not supported (x86, x86_64 et PowerPc are), qemu detect it is not here at configure time and compile without it.
I also compiled spice, as it's not available by defaut on archlinuxarm (don't know why).