Repro

Try to build the repo using latest mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-cross-freebsd-12 image

Result:

Build breaks (src/native/libs/System.Native/pal_networkstatistics.c(430,16): error G3B749D71: (NETCORE_ENGINEERING_TELEMETRY=Build) assigning to 'struct inpcb' from incompatible type 'struct xinpcb')

Context #78522

Revert #78526 as part of fixing this issue.