[Lazarus] Aarch64 as CPU target for RPi3 with Linux as OS

[Alfred]

While preparing fpc(laz)up for my RPi3, I did encounter an error with 
Lazarus.

Choosing a64 as CPU target in Lazarus does not work on my system.
Manually (command line) choosing aarch64 as CPU target however, does 
work.

Am I doing something wrong ?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lazarus-ide.org/pipermail/lazarus/attachments/20160301/6dcde117/attachment-0002.html>