Created attachment 249821 [details] poudriere build log I get the following error trying to build bazel in 13.3 jail: external/upb/upb/mini_table.c:634:14: error: defining a type within '__builtin_offsetof' is a Clang extension [-Werror,-Wgnu-offsetof-extensions] Might be, it needs something similar to https://reviews.freebsd.org/D42729 as well.