pinephone - phone number registration failed (pine64, aarch64, running postmarket os (alpine linux))

I compiled and started the signald (vers. 0.9.0) daemon based on the guide on gitlab. I'am able to connect to the signald socket (/var/run/signald/signald.sock). When I try to register my phone number ({"type": "register", "username": "+43....."} I receive the following error (stdout from signald):

signald_error_pinephone

"ld-linux-x86-64.so.2" is missing as the pinephone is an arm based device.

Can I solve this issue by changing the required library to "ld-linux-aarch64.so.1" which seems to be available? If yes, which file needs to be modified?

Edited by Ralf Niederhammer