diff --git a/libc-test/build.rs b/libc-test/build.rs
index 07f06039dd27b..fee2421743486 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -2569,6 +2569,7 @@ fn test_freebsd(target: &str) {
         "netinet/sctp.h",
         "netinet/tcp.h",
         "netinet/udp.h",
+        "netinet6/in6_var.h",
         "poll.h",
         "pthread.h",
         "pthread_np.h",
diff --git a/libc-test/semver/apple.txt b/libc-test/semver/apple.txt
index cf1d92de132dc..a20f696e7e3c1 100644
--- a/libc-test/semver/apple.txt
+++ b/libc-test/semver/apple.txt
@@ -527,6 +527,19 @@ IFF_RUNNING
 IFF_SIMPLEX
 IFF_UP
 IMAXBEL
+IN6_IFF_ANYCAST
+IN6_IFF_AUTOCONF
+IN6_IFF_CLAT46
+IN6_IFF_DEPRECATED
+IN6_IFF_DETACHED
+IN6_IFF_DUPLICATED
+IN6_IFF_DYNAMIC
+IN6_IFF_NODAD
+IN6_IFF_NOPFX
+IN6_IFF_OPTIMISTIC
+IN6_IFF_SECURED
+IN6_IFF_TEMPORARY
+IN6_IFF_TENTATIVE
 INIT_PROCESS
 IOV_MAX
 IPC_CREAT
@@ -1349,6 +1362,7 @@ SIGIO
 SIGNATURE
 SIGSTKSZ
 SIOCGIFADDR
+SIOCGIFAFLAG_IN6
 SOCK_MAXADDRLEN
 SOCK_RAW
 SOCK_RDM
diff --git a/libc-test/semver/freebsd.txt b/libc-test/semver/freebsd.txt
index 5d070f952f3cc..9c51762fb0268 100644
--- a/libc-test/semver/freebsd.txt
+++ b/libc-test/semver/freebsd.txt
@@ -516,6 +516,15 @@ IFF_SIMPLEX
 IFF_STATICARP
 IFF_UP
 IMAXBEL
+IN6_IFF_ANYCAST
+IN6_IFF_AUTOCONF
+IN6_IFF_DEPRECATED
+IN6_IFF_DETACHED
+IN6_IFF_DUPLICATED
+IN6_IFF_NODAD
+IN6_IFF_PREFER_SOURCE
+IN6_IFF_TEMPORARY
+IN6_IFF_TENTATIVE
 INIT_PROCESS
 IOV_MAX
 IPC_CREAT
@@ -1444,6 +1453,7 @@ SIGLWP
 SIGSTKSZ
 SIGTHR
 SIOCGIFADDR
+SIOCGIFAFLAG_IN6
 SLIPDISC
 SOCKCREDSIZE
 SOCK_CLOEXEC
diff --git a/src/new/apple/xnu/mod.rs b/src/new/apple/xnu/mod.rs
index 8b8afb6bc39d3..9978fdc8f1a75 100644
--- a/src/new/apple/xnu/mod.rs
+++ b/src/new/apple/xnu/mod.rs
@@ -27,4 +27,6 @@ pub(crate) mod machine {
     pub(crate) mod _mcontext;
 }
 
+pub(crate) mod netinet6;
+
 pub(crate) mod sys;
diff --git a/src/new/apple/xnu/netinet6/in6_var.rs b/src/new/apple/xnu/netinet6/in6_var.rs
new file mode 100644
index 0000000000000..fc06537087e24
--- /dev/null
+++ b/src/new/apple/xnu/netinet6/in6_var.rs
@@ -0,0 +1,21 @@
+//! Header: `netinet6/in6_var.h`
+//!
+//! <https://github.com/apple-oss-distributions/xnu/blob/main/bsd/netinet6/in6_var.h>
+
+use crate::prelude::*;
+
+pub const IN6_IFF_ANYCAST: c_int = 0x0001;
+pub const IN6_IFF_TENTATIVE: c_int = 0x0002;
+pub const IN6_IFF_DUPLICATED: c_int = 0x0004;
+pub const IN6_IFF_DETACHED: c_int = 0x0008;
+pub const IN6_IFF_DEPRECATED: c_int = 0x0010;
+pub const IN6_IFF_NODAD: c_int = 0x0020;
+pub const IN6_IFF_AUTOCONF: c_int = 0x0040;
+pub const IN6_IFF_TEMPORARY: c_int = 0x0080;
+pub const IN6_IFF_DYNAMIC: c_int = 0x0100;
+pub const IN6_IFF_OPTIMISTIC: c_int = 0x0200;
+pub const IN6_IFF_SECURED: c_int = 0x0400;
+pub const IN6_IFF_CLAT46: c_int = 0x1000;
+pub const IN6_IFF_NOPFX: c_int = 0x8000;
+
+pub const SIOCGIFAFLAG_IN6: c_ulong = 0xc1206949; // _IOWR('i', 73, in6_ifreq)
diff --git a/src/new/apple/xnu/netinet6/mod.rs b/src/new/apple/xnu/netinet6/mod.rs
new file mode 100644
index 0000000000000..1592863f7314e
--- /dev/null
+++ b/src/new/apple/xnu/netinet6/mod.rs
@@ -0,0 +1,5 @@
+//! Directory: `netinet6/`
+//!
+//! <https://github.com/apple-oss-distributions/xnu/tree/main/bsd/netinet6>
+
+pub(crate) mod in6_var;
diff --git a/src/new/freebsd/mod.rs b/src/new/freebsd/mod.rs
index eedf235d1e235..6bc38335f5361 100644
--- a/src/new/freebsd/mod.rs
+++ b/src/new/freebsd/mod.rs
@@ -3,5 +3,6 @@
 //! * Headers: <https://github.com/freebsd/freebsd-src/blob/main/sys/riscv/include/ucontext.h>
 //! * Symbol map: <https://github.com/freebsd/freebsd-src/blob/main/lib/libc/gen/Symbol.map>
 
+pub(crate) mod netinet6;
 pub(crate) mod sys;
 pub(crate) mod unistd;
diff --git a/src/new/freebsd/netinet6/in6_var.rs b/src/new/freebsd/netinet6/in6_var.rs
new file mode 100644
index 0000000000000..7d6822ea31f88
--- /dev/null
+++ b/src/new/freebsd/netinet6/in6_var.rs
@@ -0,0 +1,17 @@
+//! Header: `netinet6/in6_var.h`
+//!
+//! https://github.com/freebsd/freebsd-src/blob/main/sys/netinet6/in6_var.h
+
+use crate::prelude::*;
+
+pub const IN6_IFF_ANYCAST: c_int = 0x01;
+pub const IN6_IFF_TENTATIVE: c_int = 0x02;
+pub const IN6_IFF_DUPLICATED: c_int = 0x04;
+pub const IN6_IFF_DETACHED: c_int = 0x08;
+pub const IN6_IFF_DEPRECATED: c_int = 0x10;
+pub const IN6_IFF_NODAD: c_int = 0x20;
+pub const IN6_IFF_AUTOCONF: c_int = 0x40;
+pub const IN6_IFF_TEMPORARY: c_int = 0x80;
+pub const IN6_IFF_PREFER_SOURCE: c_int = 0x0100;
+
+pub const SIOCGIFAFLAG_IN6: c_ulong = 0xc1206949; // _IOWR('i', 73, in6_ifreq)
diff --git a/src/new/freebsd/netinet6/mod.rs b/src/new/freebsd/netinet6/mod.rs
new file mode 100644
index 0000000000000..848e809aaa8c3
--- /dev/null
+++ b/src/new/freebsd/netinet6/mod.rs
@@ -0,0 +1,5 @@
+//! Directory: `netinet6/`
+//!
+//! https://github.com/freebsd/freebsd-src/tree/main/sys/netinet6
+
+pub(crate) mod in6_var;
diff --git a/src/new/mod.rs b/src/new/mod.rs
index 073041842026c..ee7edf516c15b 100644
--- a/src/new/mod.rs
+++ b/src/new/mod.rs
@@ -197,6 +197,7 @@ cfg_if! {
         #[cfg(target_env = "gnu")]
         pub use net::route::*;
     } else if #[cfg(target_vendor = "apple")] {
+        pub use netinet6::in6_var::*;
         pub use pthread_::introspection::*;
         pub use pthread_::pthread_spis::*;
         pub use pthread_::spawn::*;
@@ -221,6 +222,7 @@ cfg_if! {
         pub use net::bpf::*;
         pub use net::if_::*;
     } else if #[cfg(target_os = "freebsd")] {
+        pub use netinet6::in6_var::*;
         pub use sys::file::*;
     }
 }