Also playing catchup trying to get some CHERI BSD examples built up as
recipes. Might ping you on the basics here if poss. and try to write up.

Having more purecap libraries would be great, thank you.

One really basic question is when you build the your demo app how is it
build for PureCap/compatibility API? I can's see this using llvm-objdump

You can tell that the app is "purcap" by reading the elf header.

Entry point address LSB set to 1 will load the app in C64 mode, the flags field will also be set to 0x1000.

Pawel