Lilypond 2.20 and 2.21 crash on Arch Linux

[Andrew Bernard]

Just getting back into lilypond but nowadays on Arch Linux. Sorry to
say both recent versions dump core:
...
elapsed time: 0.61 seconds
Element count 12833 (spanners 1146)
Preprocessing graphical objects...
Grob count 19105Segmentation fault (core dumped)

Version from Arch AUR repository and Arch repository.

I have not yet tried building from source.

Anybody else out there on Arch?

Andrew