diff --git a/libc-test/test/linux_elf.rs b/libc-test/test/linux_elf.rs
index 8744200e82aa5..d149c9aaff38e 100644
--- a/libc-test/test/linux_elf.rs
+++ b/libc-test/test/linux_elf.rs
@@ -7,4 +7,6 @@ use libc::*;
 include!(concat!(env!("OUT_DIR"), "/linux_elf.rs"));
 
 #[cfg(not(target_os = "linux"))]
-fn main() { println!("PASSED 0 tests"); }
+fn main() {
+    println!("PASSED 0 tests");
+}
diff --git a/libc-test/test/linux_fcntl.rs b/libc-test/test/linux_fcntl.rs
index 915a87dc7595b..49c06cc4f6517 100644
--- a/libc-test/test/linux_fcntl.rs
+++ b/libc-test/test/linux_fcntl.rs
@@ -7,4 +7,6 @@ use libc::*;
 include!(concat!(env!("OUT_DIR"), "/linux_fcntl.rs"));
 
 #[cfg(not(any(target_os = "linux", target_os = "android")))]
-fn main() { println!("PASSED 0 tests"); }
+fn main() {
+    println!("PASSED 0 tests");
+}
diff --git a/libc-test/test/linux_ipv6.rs b/libc-test/test/linux_ipv6.rs
index c4d0965a0f990..83c389ce16a03 100644
--- a/libc-test/test/linux_ipv6.rs
+++ b/libc-test/test/linux_ipv6.rs
@@ -7,4 +7,6 @@ use libc::*;
 include!(concat!(env!("OUT_DIR"), "/linux_ipv6.rs"));
 
 #[cfg(not(target_os = "linux"))]
-fn main() { println!("PASSED 0 tests"); }
+fn main() {
+    println!("PASSED 0 tests");
+}
diff --git a/libc-test/test/linux_strerror_r.rs b/libc-test/test/linux_strerror_r.rs
index 5139175f9ead6..17db959d8cb93 100644
--- a/libc-test/test/linux_strerror_r.rs
+++ b/libc-test/test/linux_strerror_r.rs
@@ -7,4 +7,6 @@ use libc::*;
 include!(concat!(env!("OUT_DIR"), "/linux_strerror_r.rs"));
 
 #[cfg(not(any(target_os = "linux", target_os = "android")))]
-fn main() { println!("PASSED 0 tests"); }
+fn main() {
+    println!("PASSED 0 tests");
+}
diff --git a/libc-test/test/linux_termios.rs b/libc-test/test/linux_termios.rs
index 9ee47631e530b..703a9b9b25b0d 100644
--- a/libc-test/test/linux_termios.rs
+++ b/libc-test/test/linux_termios.rs
@@ -7,4 +7,6 @@ use libc::*;
 include!(concat!(env!("OUT_DIR"), "/linux_termios.rs"));
 
 #[cfg(not(any(target_os = "linux", target_os = "android")))]
-fn main() { println!("PASSED 0 tests"); }
+fn main() {
+    println!("PASSED 0 tests");
+}
diff --git a/src/fuchsia/aarch64.rs b/src/fuchsia/aarch64.rs
index 572f8c1ce3ae1..bfe12b4dac71f 100644
--- a/src/fuchsia/aarch64.rs
+++ b/src/fuchsia/aarch64.rs
@@ -66,8 +66,16 @@ pub const MINSIGSTKSZ: ::size_t = 6144;
 pub const SIGSTKSZ: ::size_t = 12288;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const PF_MAX: ::c_int = 43;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = PF_MAX;
 
 pub const SYS_io_setup: ::c_long = 0;
diff --git a/src/fuchsia/x86_64.rs b/src/fuchsia/x86_64.rs
index eb220998e870a..87e98a260f927 100644
--- a/src/fuchsia/x86_64.rs
+++ b/src/fuchsia/x86_64.rs
@@ -486,6 +486,15 @@ pub const SIGSTKSZ: ::size_t = 8192;
 pub const MINSIGSTKSZ: ::size_t = 2048;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 42;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index f4343dee5b8cf..907be82ced22e 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -2083,6 +2083,10 @@ pub const AF_NETBIOS: ::c_int = 33;
 pub const AF_PPP: ::c_int = 34;
 pub const pseudo_AF_HDRCMPLT: ::c_int = 35;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 40;
 pub const AF_SYS_CONTROL: ::c_int = 2;
 
@@ -2125,11 +2129,16 @@ pub const PF_SYSTEM: ::c_int = AF_SYSTEM;
 pub const PF_NETBIOS: ::c_int = AF_NETBIOS;
 pub const PF_PPP: ::c_int =  AF_PPP;
 #[doc(hidden)]
-#[deprecated(since = "0.2.55")]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int =  AF_MAX;
 
 #[doc(hidden)]
 #[deprecated(since = "0.2.55")]
+#[allow(deprecated)]
 pub const NET_MAXID: ::c_int = AF_MAX;
 
 pub const NET_RT_DUMP: ::c_int = 1;
diff --git a/src/unix/bsd/freebsdlike/dragonfly/mod.rs b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
index b0604a2b19d42..84bc31ab94af1 100644
--- a/src/unix/bsd/freebsdlike/dragonfly/mod.rs
+++ b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
@@ -891,9 +891,20 @@ pub const TCP_FASTKEEP:   ::c_int = 128;
 pub const AF_BLUETOOTH: ::c_int = 33;
 pub const AF_MPLS: ::c_int = 34;
 pub const AF_IEEE80211: ::c_int = 35;
+#[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 36;
 
 pub const PF_BLUETOOTH: ::c_int = AF_BLUETOOTH;
+#[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 pub const NET_RT_DUMP: ::c_int = 1;
@@ -904,6 +915,11 @@ pub const NET_RT_MAXID: ::c_int = 4;
 pub const SOMAXOPT_SIZE: ::c_int = 65536;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const NET_MAXID: ::c_int = AF_MAX;
 
 pub const MSG_UNUSED09: ::c_int = 0x00000200;
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index d7d4c6c62616e..060e520264b37 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -625,6 +625,10 @@ pub const AF_IEEE80211: ::c_int = 37;
 pub const AF_INET_SDP: ::c_int = 40;
 pub const AF_INET6_SDP: ::c_int = 42;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 42;
 
 // https://github.com/freebsd/freebsd/blob/master/sys/net/if.h#L140
@@ -636,7 +640,6 @@ pub const IFF_POINTOPOINT: ::c_int = 0x10; // (i) is a point-to-point link
 // 0x20           was IFF_SMART
 pub const IFF_RUNNING: ::c_int = 0x40; // (d) resources allocated
 #[doc(hidden)]
-#[doc(hidden)]
 #[deprecated(
     since="0.2.54",
     note="IFF_DRV_RUNNING is deprecated. Use the portable IFF_RUNNING instead"
@@ -934,6 +937,11 @@ pub const PF_IEEE80211: ::c_int = AF_IEEE80211;
 pub const PF_INET_SDP: ::c_int = AF_INET_SDP;
 pub const PF_INET6_SDP: ::c_int = AF_INET6_SDP;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 pub const NET_RT_DUMP: ::c_int = 1;
@@ -971,6 +979,7 @@ pub const SHM_ANON: *mut ::c_char = 1 as *mut ::c_char;
 // compatibility only, and are scheduled to be removed in libc 1.0.0.
 #[doc(hidden)]
 #[deprecated(since="0.2.54",note="Removed in FreeBSD 11")]
+#[allow(deprecated)]
 pub const NET_MAXID: ::c_int = AF_MAX;
 #[doc(hidden)]
 #[deprecated(since="0.2.54",note="Removed in FreeBSD 11")]
diff --git a/src/unix/bsd/netbsdlike/netbsd/mod.rs b/src/unix/bsd/netbsdlike/netbsd/mod.rs
index d4ccd6775a5bd..ec1cbe6fcbd5b 100644
--- a/src/unix/bsd/netbsdlike/netbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -853,8 +853,19 @@ pub const AF_BLUETOOTH: ::c_int = 31;
 pub const AF_IEEE80211: ::c_int = 32;
 pub const AF_MPLS: ::c_int = 33;
 pub const AF_ROUTE: ::c_int = 34;
+#[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 36;
 
+#[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const NET_MAXID: ::c_int = AF_MAX;
 pub const NET_RT_DUMP: ::c_int = 1;
 pub const NET_RT_FLAGS: ::c_int = 2;
@@ -870,6 +881,13 @@ pub const PF_KEY: ::c_int = pseudo_AF_KEY;
 pub const PF_BLUETOOTH: ::c_int = AF_BLUETOOTH;
 pub const PF_MPLS: ::c_int = AF_MPLS;
 pub const PF_ROUTE: ::c_int = AF_ROUTE;
+
+#[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 pub const MSG_NBIO: ::c_int = 0x1000;
diff --git a/src/unix/bsd/netbsdlike/openbsd/mod.rs b/src/unix/bsd/netbsdlike/openbsd/mod.rs
index e3efae9e8bf58..d6114b9f9fbd2 100644
--- a/src/unix/bsd/netbsdlike/openbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/openbsd/mod.rs
@@ -835,9 +835,18 @@ pub const AF_MPLS: ::c_int = 33;
 pub const pseudo_AF_PFLOW: ::c_int = 34;
 pub const pseudo_AF_PIPEX: ::c_int = 35;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 36;
 
 #[doc(hidden)]
+#[allow(deprecated)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const NET_MAXID: ::c_int = AF_MAX;
 pub const NET_RT_DUMP: ::c_int = 1;
 pub const NET_RT_FLAGS: ::c_int = 2;
@@ -862,6 +871,11 @@ pub const PF_MPLS: ::c_int = AF_MPLS;
 pub const PF_PFLOW: ::c_int = pseudo_AF_PFLOW;
 pub const PF_PIPEX: ::c_int = pseudo_AF_PIPEX;
 #[doc(hidden)]
+#[allow(deprecated)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 pub const SCM_TIMESTAMP: ::c_int = 0x04;
diff --git a/src/unix/haiku/mod.rs b/src/unix/haiku/mod.rs
index 56df0db586dc8..9e3f673d2a909 100644
--- a/src/unix/haiku/mod.rs
+++ b/src/unix/haiku/mod.rs
@@ -770,6 +770,11 @@ pub const AF_NOTIFY: ::c_int = 8;
 pub const AF_LOCAL: ::c_int = 9;
 pub const AF_UNIX: ::c_int = AF_LOCAL;
 pub const AF_BLUETOOTH: ::c_int = 10;
+#[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 11;
 
 pub const IP_OPTIONS: ::c_int = 1;
diff --git a/src/unix/notbsd/android/mod.rs b/src/unix/notbsd/android/mod.rs
index bab0218b6bf89..7b4c62cfe3314 100644
--- a/src/unix/notbsd/android/mod.rs
+++ b/src/unix/notbsd/android/mod.rs
@@ -918,8 +918,17 @@ pub const SOL_NETROM: ::c_int = 259;
 pub const SOL_ROSE: ::c_int = 260;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 43;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 /* DCCP socket options */
diff --git a/src/unix/notbsd/emscripten/mod.rs b/src/unix/notbsd/emscripten/mod.rs
index 07a2054561d99..bdf9785e2dd58 100644
--- a/src/unix/notbsd/emscripten/mod.rs
+++ b/src/unix/notbsd/emscripten/mod.rs
@@ -922,12 +922,21 @@ pub const AF_MPLS: ::c_int = 28;
 pub const AF_NFC: ::c_int = 39;
 pub const AF_VSOCK: ::c_int = 40;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 42;
 pub const PF_IB: ::c_int = AF_IB;
 pub const PF_MPLS: ::c_int = AF_MPLS;
 pub const PF_NFC: ::c_int = AF_NFC;
 pub const PF_VSOCK: ::c_int = AF_VSOCK;
 #[doc(hidden)]
+#[allow(deprecated)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 // System V IPC
diff --git a/src/unix/notbsd/linux/mips/mod.rs b/src/unix/notbsd/linux/mips/mod.rs
index 083572a2c6c42..a4a3886543eff 100644
--- a/src/unix/notbsd/linux/mips/mod.rs
+++ b/src/unix/notbsd/linux/mips/mod.rs
@@ -895,8 +895,17 @@ pub const NFT_NG_INCREMENTAL: ::c_int = 0;
 pub const NFT_NG_RANDOM: ::c_int = 1;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 45;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 f! {
diff --git a/src/unix/notbsd/linux/musl/b32/arm.rs b/src/unix/notbsd/linux/musl/b32/arm.rs
index c5feafc12dd64..ac96c36ee682d 100644
--- a/src/unix/notbsd/linux/musl/b32/arm.rs
+++ b/src/unix/notbsd/linux/musl/b32/arm.rs
@@ -839,6 +839,15 @@ pub const SYS_pkey_alloc: ::c_long = 395;
 pub const SYS_pkey_free: ::c_long = 396;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 45;
 #[doc(hidden)]
+#[allow(deprecated)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const PF_MAX: ::c_int = AF_MAX;
diff --git a/src/unix/notbsd/linux/musl/b32/mips.rs b/src/unix/notbsd/linux/musl/b32/mips.rs
index 514c480eb0235..baf3d7f4ee0f9 100644
--- a/src/unix/notbsd/linux/musl/b32/mips.rs
+++ b/src/unix/notbsd/linux/musl/b32/mips.rs
@@ -848,6 +848,15 @@ pub const SYS_preadv2: ::c_long = 4000 + 361;
 pub const SYS_pwritev2: ::c_long = 4000 + 362;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 42;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
diff --git a/src/unix/notbsd/linux/musl/b32/powerpc.rs b/src/unix/notbsd/linux/musl/b32/powerpc.rs
index f62cf6295d853..e42e4caf30e3c 100644
--- a/src/unix/notbsd/linux/musl/b32/powerpc.rs
+++ b/src/unix/notbsd/linux/musl/b32/powerpc.rs
@@ -865,6 +865,15 @@ pub const SYS_pkey_free: ::c_long = 385;
 pub const SYS_pkey_mprotect: ::c_long = 386;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 43;
 #[doc(hidden)]
+#[allow(deprecated)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const PF_MAX: ::c_int = AF_MAX;
diff --git a/src/unix/notbsd/linux/musl/b32/x86.rs b/src/unix/notbsd/linux/musl/b32/x86.rs
index 95395f0a7afd0..4618985c70013 100644
--- a/src/unix/notbsd/linux/musl/b32/x86.rs
+++ b/src/unix/notbsd/linux/musl/b32/x86.rs
@@ -947,6 +947,15 @@ pub const UESP: ::c_int = 15;
 pub const SS: ::c_int = 16;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 45;
 #[doc(hidden)]
+#[allow(deprecated)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const PF_MAX: ::c_int = AF_MAX;
diff --git a/src/unix/notbsd/linux/musl/b64/aarch64.rs b/src/unix/notbsd/linux/musl/b64/aarch64.rs
index af654e31a3864..f376ba05d3256 100644
--- a/src/unix/notbsd/linux/musl/b64/aarch64.rs
+++ b/src/unix/notbsd/linux/musl/b64/aarch64.rs
@@ -71,8 +71,17 @@ pub const MINSIGSTKSZ: ::size_t = 6144;
 pub const SIGSTKSZ: ::size_t = 12288;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const PF_MAX: ::c_int = 45;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const AF_MAX: ::c_int = PF_MAX;
 
 pub const MADV_SOFT_OFFLINE: ::c_int = 101;
diff --git a/src/unix/notbsd/linux/musl/b64/powerpc64.rs b/src/unix/notbsd/linux/musl/b64/powerpc64.rs
index 4230669087f22..8e360afb79301 100644
--- a/src/unix/notbsd/linux/musl/b64/powerpc64.rs
+++ b/src/unix/notbsd/linux/musl/b64/powerpc64.rs
@@ -71,8 +71,17 @@ pub const SIGSTKSZ: ::size_t = 10240;
 pub const MINSIGSTKSZ: ::size_t = 4096;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 45;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 // Syscall table
diff --git a/src/unix/notbsd/linux/musl/b64/x86_64.rs b/src/unix/notbsd/linux/musl/b64/x86_64.rs
index 3e2f1a435aea0..a5fc2b61933a9 100644
--- a/src/unix/notbsd/linux/musl/b64/x86_64.rs
+++ b/src/unix/notbsd/linux/musl/b64/x86_64.rs
@@ -494,8 +494,17 @@ pub const SIGSTKSZ: ::size_t = 8192;
 pub const MINSIGSTKSZ: ::size_t = 2048;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 45;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 pub const RLIMIT_NLIMITS: ::c_int = 15;
diff --git a/src/unix/notbsd/linux/other/mod.rs b/src/unix/notbsd/linux/other/mod.rs
index 26c9ad4c544a3..46fe054a6d16b 100644
--- a/src/unix/notbsd/linux/other/mod.rs
+++ b/src/unix/notbsd/linux/other/mod.rs
@@ -927,8 +927,17 @@ pub const M_ARENA_TEST: ::c_int = -7;
 pub const M_ARENA_MAX: ::c_int = -8;
 
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 45;
 #[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
+#[allow(deprecated)]
 pub const PF_MAX: ::c_int = AF_MAX;
 
 cfg_if! {
diff --git a/src/unix/solarish/mod.rs b/src/unix/solarish/mod.rs
index de7c1cde8e589..0157f47ab372e 100644
--- a/src/unix/solarish/mod.rs
+++ b/src/unix/solarish/mod.rs
@@ -1175,6 +1175,12 @@ pub const AF_INET_OFFLOAD: ::c_int = 30;
 pub const AF_TRILL: ::c_int = 31;
 pub const AF_PACKET: ::c_int = 32;
 pub const AF_LX_NETLINK: ::c_int = 33;
+
+#[doc(hidden)]
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 33;
 pub const SOCK_DGRAM: ::c_int = 1;
 pub const SOCK_STREAM: ::c_int = 2;
diff --git a/src/unix/uclibc/mod.rs b/src/unix/uclibc/mod.rs
index 3fd64ca28130a..e51b49ab81058 100644
--- a/src/unix/uclibc/mod.rs
+++ b/src/unix/uclibc/mod.rs
@@ -1445,6 +1445,10 @@ pub const NOSTR: ::nl_item = 0x503;
 
 pub const FILENAME_MAX: ::c_uint = 4095;
 
+#[deprecated(
+    since = "0.2.55",
+    note = "If you are using this report to: https://github.com/rust-lang/libc/issues/665"
+)]
 pub const AF_MAX: ::c_int = 39;
 
 f! {