Re: [PATCH v6 0/6] MR6866: ntdll: On macOS x86_64, swap GSBASE between the TEB and macOS TSD when entering/leaving PE code.

[Jinoh Kang (＠iamahuman)]

> checking at compile time against `sys/syscall.h` will be sufficient here I would guess.

It's not in `sys/syscall.h`. thread_set_tsd_base() is a machdep syscall.