Problems with native build on a Mac M2

[spike7638]

I've been trying to resurrect some reprocessing code to run on my Mac M2 (Sonoma 14.7). Compiling the most basic example (the blue square on a pink background) works fine with npm run build; when I try npm run build:native, I get this:

> build:native
> bsb -make-world -backend native

ninja: no work to do.
[1/2] Building src/tsdl_new.cmx
/var/folders/kv/96mvfpgd641dg5m4tpn4wm980000gp/T/camlasm4fb328-b7a24e.s:238:2: error: invalid CFI advance_loc expression
 .cfi_adjust_cfa_offset -8
 ^
/var/folders/kv/96mvfpgd641dg5m4tpn4wm980000gp/T/camlasm4fb328-b7a24e.s:246:2: error: invalid CFI advance_loc expression
 .cfi_adjust_cfa_offset -8
 ^

  We've found a bug for you!
  /Users/jhughes/Documents/Projects/ReasonML/reprocessingExample/reprocessing-example/node_modules/@bsansouci/tsdl/src/tsdl_new.re
  
  Assembler error, input left in file /var/folders/kv/96mvfpgd641dg5m4tpn4wm980000gp/T/camlasm4fb328.s
  
Failure: /Users/jhughes/Documents/Projects/ReasonML/reprocessingExample/reprocessing-example/node_modules/bsb-native/lib/ninja.exe 
 Location: /Users/jhughes/Documents/Projects/ReasonML/reprocessingExample/reprocessing-example/node_modules/@bsansouci/tsdl/lib/bs/native

I'm afraid that an assembler error is beyond me. Worried that maybe I didn't have a recent enough version of Ocaml installed, I got some help making sure that was OK (see ocaml/opam-repository#26896), but apparently that was not the problem.

I know this project seems to be mostly mothballed, but I'm hoping this might be an easy fix.