So I wrote some code that uses map_rect in RStan prior to OS X Catalina. I had it working fine by setting the DSTAN_THREADS environmental variable in my Makevars file. However, I know that all of this got changed with Catalina. Right now, if I add the += DSTAN_THREADS to my Makevars code won’t compile any more.
Anyone solve this? (PS I can run it just fine in cmdStan but prefer to use RStan where possible.)