It look like atomicFetchAdd a atomicFetchSub was added to ldc 8 days ago and my distro has old version. I replace core.internal.atomic with this https://raw.githubusercontent.com/ldc-developers/druntime/ldc/src/core/internal/atomic.d and now everything works.
It's not even in the latest stable version. Should be available in next release. Also, please note that I haven't had the time to check if anything else was missing. If you do spot something else that is missing, please let me know.
