www/iridium build failing with missing swiftshader file

From: bob prohaska <fbsd_at_www.zefox.net>
Date: Sat, 07 Oct 2023 17:43:03 UTC
A poudriere build of www/iridium quits at the very
end with a missing file. The message is 
===>  Building package for iridium-browser-2023.09.116.2
pkg-static: Unable to access file /wrkdirs/usr/ports/www/iridium/work/stage/usr/local/share/iridium/swiftshader/:No such file or directory
*** Error code 1

This happens to be on a Pi4 running -current.

Is there a fix or workaround?

Can the build be restarted where it left off?

Thanks for reading,

bob prohaska