diff --git a/libc-test/build.rs b/libc-test/build.rs
index d828b9f..b199d1c 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -2130,6 +2130,8 @@
             // Require Linux kernel 5.x:
             | "MSG_COPY"
                if musl  => true,
+            // Require Linux kernel 5.1:
+            "F_SEAL_FUTURE_WRITE" => true,
 
             // The musl version 1.0.22 used in CI does not
             // contain these glibc constants yet:
diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index f4343de..691e0ed 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -2471,34 +2471,34 @@
 pub const NOTE_TRACKERR: ::uint32_t = 0x00000002;
 pub const NOTE_CHILD: ::uint32_t = 0x00000004;
 
-pub const OCRNL: ::c_int = 0x00000010;
-pub const ONOCR: ::c_int = 0x00000020;
-pub const ONLRET: ::c_int = 0x00000040;
-pub const OFILL: ::c_int = 0x00000080;
-pub const NLDLY: ::c_int = 0x00000300;
-pub const TABDLY: ::c_int = 0x00000c04;
-pub const CRDLY: ::c_int = 0x00003000;
-pub const FFDLY: ::c_int = 0x00004000;
-pub const BSDLY: ::c_int = 0x00008000;
-pub const VTDLY: ::c_int = 0x00010000;
-pub const OFDEL: ::c_int = 0x00020000;
+pub const OCRNL: ::tcflag_t = 0x00000010;
+pub const ONOCR: ::tcflag_t = 0x00000020;
+pub const ONLRET: ::tcflag_t = 0x00000040;
+pub const OFILL: ::tcflag_t = 0x00000080;
+pub const NLDLY: ::tcflag_t = 0x00000300;
+pub const TABDLY: ::tcflag_t = 0x00000c04;
+pub const CRDLY: ::tcflag_t = 0x00003000;
+pub const FFDLY: ::tcflag_t = 0x00004000;
+pub const BSDLY: ::tcflag_t = 0x00008000;
+pub const VTDLY: ::tcflag_t = 0x00010000;
+pub const OFDEL: ::tcflag_t = 0x00020000;
 
-pub const NL0: ::c_int  = 0x00000000;
-pub const NL1: ::c_int  = 0x00000100;
-pub const TAB0: ::c_int = 0x00000000;
-pub const TAB1: ::c_int = 0x00000400;
-pub const TAB2: ::c_int = 0x00000800;
-pub const CR0: ::c_int  = 0x00000000;
-pub const CR1: ::c_int  = 0x00001000;
-pub const CR2: ::c_int  = 0x00002000;
-pub const CR3: ::c_int  = 0x00003000;
-pub const FF0: ::c_int  = 0x00000000;
-pub const FF1: ::c_int  = 0x00004000;
-pub const BS0: ::c_int  = 0x00000000;
-pub const BS1: ::c_int  = 0x00008000;
-pub const TAB3: ::c_int = 0x00000004;
-pub const VT0: ::c_int  = 0x00000000;
-pub const VT1: ::c_int  = 0x00010000;
+pub const NL0: ::tcflag_t  = 0x00000000;
+pub const NL1: ::tcflag_t = 0x00000100;
+pub const TAB0: ::tcflag_t = 0x00000000;
+pub const TAB1: ::tcflag_t = 0x00000400;
+pub const TAB2: ::tcflag_t = 0x00000800;
+pub const CR0: ::tcflag_t  = 0x00000000;
+pub const CR1: ::tcflag_t  = 0x00001000;
+pub const CR2: ::tcflag_t  = 0x00002000;
+pub const CR3: ::tcflag_t  = 0x00003000;
+pub const FF0: ::tcflag_t  = 0x00000000;
+pub const FF1: ::tcflag_t  = 0x00004000;
+pub const BS0: ::tcflag_t  = 0x00000000;
+pub const BS1: ::tcflag_t  = 0x00008000;
+pub const TAB3: ::tcflag_t = 0x00000004;
+pub const VT0: ::tcflag_t  = 0x00000000;
+pub const VT1: ::tcflag_t  = 0x00010000;
 pub const IUTF8: ::tcflag_t = 0x00004000;
 pub const CRTSCTS: ::tcflag_t = 0x00030000;
 
diff --git a/src/unix/notbsd/android/mod.rs b/src/unix/notbsd/android/mod.rs
index d2ba4c1..b84d18e 100644
--- a/src/unix/notbsd/android/mod.rs
+++ b/src/unix/notbsd/android/mod.rs
@@ -1161,15 +1161,15 @@
 pub const MCL_FUTURE: ::c_int = 0x0002;
 
 pub const CBAUD: ::tcflag_t = 0o0010017;
-pub const TAB1: ::c_int = 0x00000800;
-pub const TAB2: ::c_int = 0x00001000;
-pub const TAB3: ::c_int = 0x00001800;
-pub const CR1: ::c_int  = 0x00000200;
-pub const CR2: ::c_int  = 0x00000400;
-pub const CR3: ::c_int  = 0x00000600;
-pub const FF1: ::c_int  = 0x00008000;
-pub const BS1: ::c_int  = 0x00002000;
-pub const VT1: ::c_int  = 0x00004000;
+pub const TAB1: ::tcflag_t = 0x00000800;
+pub const TAB2: ::tcflag_t = 0x00001000;
+pub const TAB3: ::tcflag_t = 0x00001800;
+pub const CR1: ::tcflag_t = 0x00000200;
+pub const CR2: ::tcflag_t = 0x00000400;
+pub const CR3: ::tcflag_t = 0x00000600;
+pub const FF1: ::tcflag_t = 0x00008000;
+pub const BS1: ::tcflag_t = 0x00002000;
+pub const VT1: ::tcflag_t = 0x00004000;
 pub const VWERASE: usize = 14;
 pub const VREPRINT: usize = 12;
 pub const VSUSP: usize = 10;
diff --git a/src/unix/notbsd/linux/mips/mod.rs b/src/unix/notbsd/linux/mips/mod.rs
index 083572a..f9baacb 100644
--- a/src/unix/notbsd/linux/mips/mod.rs
+++ b/src/unix/notbsd/linux/mips/mod.rs
@@ -597,15 +597,15 @@
 pub const SIGSTKSZ: ::size_t = 8192;
 pub const MINSIGSTKSZ: ::size_t = 2048;
 pub const CBAUD: ::tcflag_t = 0o0010017;
-pub const TAB1: ::c_int = 0x00000800;
-pub const TAB2: ::c_int = 0x00001000;
-pub const TAB3: ::c_int = 0x00001800;
-pub const CR1: ::c_int  = 0x00000200;
-pub const CR2: ::c_int  = 0x00000400;
-pub const CR3: ::c_int  = 0x00000600;
-pub const FF1: ::c_int  = 0x00008000;
-pub const BS1: ::c_int  = 0x00002000;
-pub const VT1: ::c_int  = 0x00004000;
+pub const TAB1: ::tcflag_t = 0x00000800;
+pub const TAB2: ::tcflag_t = 0x00001000;
+pub const TAB3: ::tcflag_t = 0x00001800;
+pub const CR1: ::tcflag_t = 0x00000200;
+pub const CR2: ::tcflag_t = 0x00000400;
+pub const CR3: ::tcflag_t = 0x00000600;
+pub const FF1: ::tcflag_t = 0x00008000;
+pub const BS1: ::tcflag_t = 0x00002000;
+pub const VT1: ::tcflag_t = 0x00004000;
 pub const VWERASE: usize = 14;
 pub const VREPRINT: usize = 12;
 pub const VSUSP: usize = 10;
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index 1e13d1b..f29e8d1 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -1082,6 +1082,8 @@
 pub const F_TLOCK: ::c_int = 2;
 pub const F_ULOCK: ::c_int = 0;
 
+pub const F_SEAL_FUTURE_WRITE: ::c_int = 0x0010;
+
 pub const IFF_LOWER_UP: ::c_int = 0x10000;
 pub const IFF_DORMANT: ::c_int = 0x20000;
 pub const IFF_ECHO: ::c_int = 0x40000;
diff --git a/src/unix/notbsd/linux/musl/b32/arm.rs b/src/unix/notbsd/linux/musl/b32/arm.rs
index c5feafc..f6117a3 100644
--- a/src/unix/notbsd/linux/musl/b32/arm.rs
+++ b/src/unix/notbsd/linux/musl/b32/arm.rs
@@ -150,17 +150,6 @@
         pub f_namemax: ::c_ulong,
         __f_spare: [::c_int; 6],
     }
-
-    pub struct termios2 {
-        pub c_iflag: ::tcflag_t,
-        pub c_oflag: ::tcflag_t,
-        pub c_cflag: ::tcflag_t,
-        pub c_lflag: ::tcflag_t,
-        pub c_line: ::cc_t,
-        pub c_cc: [::cc_t; 19],
-        pub c_ispeed: ::speed_t,
-        pub c_ospeed: ::speed_t,
-    }
 }
 
 pub const SIGSTKSZ: ::size_t = 8192;
diff --git a/src/unix/notbsd/linux/musl/b32/mips.rs b/src/unix/notbsd/linux/musl/b32/mips.rs
index 514c480..7fce2ad 100644
--- a/src/unix/notbsd/linux/musl/b32/mips.rs
+++ b/src/unix/notbsd/linux/musl/b32/mips.rs
@@ -161,17 +161,6 @@
         pub f_namemax: ::c_ulong,
         __f_spare: [::c_int; 6],
     }
-
-    pub struct termios2 {
-        pub c_iflag: ::tcflag_t,
-        pub c_oflag: ::tcflag_t,
-        pub c_cflag: ::tcflag_t,
-        pub c_lflag: ::tcflag_t,
-        pub c_line: ::cc_t,
-        pub c_cc: [::cc_t; 23],
-        pub c_ispeed: ::speed_t,
-        pub c_ospeed: ::speed_t,
-    }
 }
 
 pub const SIGSTKSZ: ::size_t = 8192;
diff --git a/src/unix/notbsd/linux/musl/b32/powerpc.rs b/src/unix/notbsd/linux/musl/b32/powerpc.rs
index f62cf62..e3ffbb9 100644
--- a/src/unix/notbsd/linux/musl/b32/powerpc.rs
+++ b/src/unix/notbsd/linux/musl/b32/powerpc.rs
@@ -153,17 +153,6 @@
         pub f_namemax: ::c_ulong,
         __f_spare: [::c_int; 6],
     }
-
-    pub struct termios2 {
-        pub c_iflag: ::tcflag_t,
-        pub c_oflag: ::tcflag_t,
-        pub c_cflag: ::tcflag_t,
-        pub c_lflag: ::tcflag_t,
-        pub c_cc: [::cc_t; 19],
-        pub c_line: ::cc_t,
-        pub c_ispeed: ::speed_t,
-        pub c_ospeed: ::speed_t,
-    }
 }
 
 pub const MADV_SOFT_OFFLINE: ::c_int = 101;
diff --git a/src/unix/notbsd/linux/musl/b32/x86.rs b/src/unix/notbsd/linux/musl/b32/x86.rs
index 95395f0..28e7dc0 100644
--- a/src/unix/notbsd/linux/musl/b32/x86.rs
+++ b/src/unix/notbsd/linux/musl/b32/x86.rs
@@ -154,17 +154,6 @@
         pub f_namemax: ::c_ulong,
         __f_spare: [::c_int; 6],
     }
-
-    pub struct termios2 {
-        pub c_iflag: ::tcflag_t,
-        pub c_oflag: ::tcflag_t,
-        pub c_cflag: ::tcflag_t,
-        pub c_lflag: ::tcflag_t,
-        pub c_line: ::cc_t,
-        pub c_cc: [::cc_t; 19],
-        pub c_ispeed: ::speed_t,
-        pub c_ospeed: ::speed_t,
-    }
 }
 
 s_no_extra_traits!{
diff --git a/src/unix/notbsd/linux/musl/b64/mod.rs b/src/unix/notbsd/linux/musl/b64/mod.rs
index 043ca8d..34b3766 100644
--- a/src/unix/notbsd/linux/musl/b64/mod.rs
+++ b/src/unix/notbsd/linux/musl/b64/mod.rs
@@ -127,17 +127,6 @@
         pub _pad: [::c_int; 29],
         _align: [usize; 0],
     }
-
-    pub struct termios2 {
-        pub c_iflag: ::tcflag_t,
-        pub c_oflag: ::tcflag_t,
-        pub c_cflag: ::tcflag_t,
-        pub c_lflag: ::tcflag_t,
-        pub c_line: ::cc_t,
-        pub c_cc: [::cc_t; 19],
-        pub c_ispeed: ::speed_t,
-        pub c_ospeed: ::speed_t,
-    }
 }
 
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
diff --git a/src/unix/notbsd/linux/other/b32/arm.rs b/src/unix/notbsd/linux/other/b32/arm.rs
index 7f00d9a..8396fcd 100644
--- a/src/unix/notbsd/linux/other/b32/arm.rs
+++ b/src/unix/notbsd/linux/other/b32/arm.rs
@@ -142,15 +142,15 @@
 pub const SIGSTKSZ: ::size_t = 8192;
 pub const MINSIGSTKSZ: ::size_t = 2048;
 pub const CBAUD: ::tcflag_t = 0o0010017;
-pub const TAB1: ::c_int = 0x00000800;
-pub const TAB2: ::c_int = 0x00001000;
-pub const TAB3: ::c_int = 0x00001800;
-pub const CR1: ::c_int  = 0x00000200;
-pub const CR2: ::c_int  = 0x00000400;
-pub const CR3: ::c_int  = 0x00000600;
-pub const FF1: ::c_int  = 0x00008000;
-pub const BS1: ::c_int  = 0x00002000;
-pub const VT1: ::c_int  = 0x00004000;
+pub const TAB1: ::tcflag_t = 0x00000800;
+pub const TAB2: ::tcflag_t = 0x00001000;
+pub const TAB3: ::tcflag_t = 0x00001800;
+pub const CR1: ::tcflag_t = 0x00000200;
+pub const CR2: ::tcflag_t = 0x00000400;
+pub const CR3: ::tcflag_t = 0x00000600;
+pub const FF1: ::tcflag_t = 0x00008000;
+pub const BS1: ::tcflag_t = 0x00002000;
+pub const VT1: ::tcflag_t = 0x00004000;
 pub const VWERASE: usize = 14;
 pub const VREPRINT: usize = 12;
 pub const VSUSP: usize = 10;
diff --git a/src/unix/notbsd/linux/other/b32/powerpc.rs b/src/unix/notbsd/linux/other/b32/powerpc.rs
index 0ea9034..d609d67 100644
--- a/src/unix/notbsd/linux/other/b32/powerpc.rs
+++ b/src/unix/notbsd/linux/other/b32/powerpc.rs
@@ -132,15 +132,15 @@
 pub const SIGSTKSZ: ::size_t = 0x4000;
 pub const MINSIGSTKSZ: ::size_t = 4096;
 pub const CBAUD: ::tcflag_t = 0xff;
-pub const TAB1: ::c_int = 0x400;
-pub const TAB2: ::c_int = 0x800;
-pub const TAB3: ::c_int = 0xc00;
-pub const CR1: ::c_int  = 0x1000;
-pub const CR2: ::c_int  = 0x2000;
-pub const CR3: ::c_int  = 0x3000;
-pub const FF1: ::c_int  = 0x4000;
-pub const BS1: ::c_int  = 0x8000;
-pub const VT1: ::c_int  = 0x10000;
+pub const TAB1: ::tcflag_t = 0x400;
+pub const TAB2: ::tcflag_t = 0x800;
+pub const TAB3: ::tcflag_t = 0xc00;
+pub const CR1: ::tcflag_t = 0x1000;
+pub const CR2: ::tcflag_t = 0x2000;
+pub const CR3: ::tcflag_t = 0x3000;
+pub const FF1: ::tcflag_t = 0x4000;
+pub const BS1: ::tcflag_t = 0x8000;
+pub const VT1: ::tcflag_t = 0x10000;
 pub const VWERASE: usize = 0xa;
 pub const VREPRINT: usize = 0xb;
 pub const VSUSP: usize = 0xc;
diff --git a/src/unix/notbsd/linux/other/b32/x86.rs b/src/unix/notbsd/linux/other/b32/x86.rs
index e7c3b9a..6ccbfbb 100644
--- a/src/unix/notbsd/linux/other/b32/x86.rs
+++ b/src/unix/notbsd/linux/other/b32/x86.rs
@@ -348,15 +348,15 @@
 pub const SIGSTKSZ: ::size_t = 8192;
 pub const MINSIGSTKSZ: ::size_t = 2048;
 pub const CBAUD: ::tcflag_t = 0o0010017;
-pub const TAB1: ::c_int = 0x00000800;
-pub const TAB2: ::c_int = 0x00001000;
-pub const TAB3: ::c_int = 0x00001800;
-pub const CR1: ::c_int  = 0x00000200;
-pub const CR2: ::c_int  = 0x00000400;
-pub const CR3: ::c_int  = 0x00000600;
-pub const FF1: ::c_int  = 0x00008000;
-pub const BS1: ::c_int  = 0x00002000;
-pub const VT1: ::c_int  = 0x00004000;
+pub const TAB1: ::tcflag_t = 0x00000800;
+pub const TAB2: ::tcflag_t = 0x00001000;
+pub const TAB3: ::tcflag_t = 0x00001800;
+pub const CR1: ::tcflag_t = 0x00000200;
+pub const CR2: ::tcflag_t = 0x00000400;
+pub const CR3: ::tcflag_t = 0x00000600;
+pub const FF1: ::tcflag_t = 0x00008000;
+pub const BS1: ::tcflag_t = 0x00002000;
+pub const VT1: ::tcflag_t = 0x00004000;
 pub const VWERASE: usize = 14;
 pub const VREPRINT: usize = 12;
 pub const VSUSP: usize = 10;
diff --git a/src/unix/notbsd/linux/other/b64/aarch64.rs b/src/unix/notbsd/linux/other/b64/aarch64.rs
index 4433b77..a10a2b0 100644
--- a/src/unix/notbsd/linux/other/b64/aarch64.rs
+++ b/src/unix/notbsd/linux/other/b64/aarch64.rs
@@ -439,15 +439,15 @@
 pub const SIGSTKSZ: ::size_t = 16384;
 pub const MINSIGSTKSZ: ::size_t = 5120;
 pub const CBAUD: ::tcflag_t = 0o0010017;
-pub const TAB1: ::c_int = 0x00000800;
-pub const TAB2: ::c_int = 0x00001000;
-pub const TAB3: ::c_int = 0x00001800;
-pub const CR1: ::c_int  = 0x00000200;
-pub const CR2: ::c_int  = 0x00000400;
-pub const CR3: ::c_int  = 0x00000600;
-pub const FF1: ::c_int  = 0x00008000;
-pub const BS1: ::c_int  = 0x00002000;
-pub const VT1: ::c_int  = 0x00004000;
+pub const TAB1: ::tcflag_t = 0x00000800;
+pub const TAB2: ::tcflag_t = 0x00001000;
+pub const TAB3: ::tcflag_t = 0x00001800;
+pub const CR1: ::tcflag_t = 0x00000200;
+pub const CR2: ::tcflag_t = 0x00000400;
+pub const CR3: ::tcflag_t = 0x00000600;
+pub const FF1: ::tcflag_t = 0x00008000;
+pub const BS1: ::tcflag_t = 0x00002000;
+pub const VT1: ::tcflag_t = 0x00004000;
 pub const VWERASE: usize = 14;
 pub const VREPRINT: usize = 12;
 pub const VSUSP: usize = 10;
diff --git a/src/unix/notbsd/linux/other/b64/powerpc64.rs b/src/unix/notbsd/linux/other/b64/powerpc64.rs
index 7c02bdf..89f5ca1 100644
--- a/src/unix/notbsd/linux/other/b64/powerpc64.rs
+++ b/src/unix/notbsd/linux/other/b64/powerpc64.rs
@@ -450,15 +450,15 @@
 pub const SIGSTKSZ: ::size_t = 0x4000;
 pub const MINSIGSTKSZ: ::size_t = 4096;
 pub const CBAUD: ::tcflag_t = 0xff;
-pub const TAB1: ::c_int = 0x400;
-pub const TAB2: ::c_int = 0x800;
-pub const TAB3: ::c_int = 0xc00;
-pub const CR1: ::c_int  = 0x1000;
-pub const CR2: ::c_int  = 0x2000;
-pub const CR3: ::c_int  = 0x3000;
-pub const FF1: ::c_int  = 0x4000;
-pub const BS1: ::c_int  = 0x8000;
-pub const VT1: ::c_int  = 0x10000;
+pub const TAB1: ::tcflag_t = 0x400;
+pub const TAB2: ::tcflag_t = 0x800;
+pub const TAB3: ::tcflag_t = 0xc00;
+pub const CR1: ::tcflag_t = 0x1000;
+pub const CR2: ::tcflag_t = 0x2000;
+pub const CR3: ::tcflag_t = 0x3000;
+pub const FF1: ::tcflag_t = 0x4000;
+pub const BS1: ::tcflag_t = 0x8000;
+pub const VT1: ::tcflag_t = 0x10000;
 pub const VWERASE: usize = 0xa;
 pub const VREPRINT: usize = 0xb;
 pub const VSUSP: usize = 0xc;
diff --git a/src/unix/notbsd/linux/other/b64/sparc64.rs b/src/unix/notbsd/linux/other/b64/sparc64.rs
index 5d26865..7c13627 100644
--- a/src/unix/notbsd/linux/other/b64/sparc64.rs
+++ b/src/unix/notbsd/linux/other/b64/sparc64.rs
@@ -404,15 +404,15 @@
 pub const SIGSTKSZ: ::size_t = 16384;
 pub const MINSIGSTKSZ: ::size_t = 4096;
 pub const CBAUD: ::tcflag_t = 0x0000100f;
-pub const TAB1: ::c_int = 0x800;
-pub const TAB2: ::c_int = 0x1000;
-pub const TAB3: ::c_int = 0x1800;
-pub const CR1: ::c_int  = 0x200;
-pub const CR2: ::c_int  = 0x400;
-pub const CR3: ::c_int  = 0x600;
-pub const FF1: ::c_int  = 0x8000;
-pub const BS1: ::c_int  = 0x2000;
-pub const VT1: ::c_int  = 0x4000;
+pub const TAB1: ::tcflag_t = 0x800;
+pub const TAB2: ::tcflag_t = 0x1000;
+pub const TAB3: ::tcflag_t = 0x1800;
+pub const CR1: ::tcflag_t = 0x200;
+pub const CR2: ::tcflag_t = 0x400;
+pub const CR3: ::tcflag_t = 0x600;
+pub const FF1: ::tcflag_t = 0x8000;
+pub const BS1: ::tcflag_t = 0x2000;
+pub const VT1: ::tcflag_t = 0x4000;
 pub const VWERASE: usize = 0xe;
 pub const VREPRINT: usize = 0xc;
 pub const VSUSP: usize = 0xa;
diff --git a/src/unix/notbsd/linux/other/b64/x86_64.rs b/src/unix/notbsd/linux/other/b64/x86_64.rs
index 3bd8288..0ef8001 100644
--- a/src/unix/notbsd/linux/other/b64/x86_64.rs
+++ b/src/unix/notbsd/linux/other/b64/x86_64.rs
@@ -605,15 +605,15 @@
 pub const SIGSTKSZ: ::size_t = 8192;
 pub const MINSIGSTKSZ: ::size_t = 2048;
 pub const CBAUD: ::tcflag_t = 0o0010017;
-pub const TAB1: ::c_int = 0x00000800;
-pub const TAB2: ::c_int = 0x00001000;
-pub const TAB3: ::c_int = 0x00001800;
-pub const CR1: ::c_int  = 0x00000200;
-pub const CR2: ::c_int  = 0x00000400;
-pub const CR3: ::c_int  = 0x00000600;
-pub const FF1: ::c_int  = 0x00008000;
-pub const BS1: ::c_int  = 0x00002000;
-pub const VT1: ::c_int  = 0x00004000;
+pub const TAB1: ::tcflag_t = 0x00000800;
+pub const TAB2: ::tcflag_t = 0x00001000;
+pub const TAB3: ::tcflag_t = 0x00001800;
+pub const CR1: ::tcflag_t = 0x00000200;
+pub const CR2: ::tcflag_t = 0x00000400;
+pub const CR3: ::tcflag_t = 0x00000600;
+pub const FF1: ::tcflag_t = 0x00008000;
+pub const BS1: ::tcflag_t = 0x00002000;
+pub const VT1: ::tcflag_t = 0x00004000;
 pub const VWERASE: usize = 14;
 pub const VREPRINT: usize = 12;
 pub const VSUSP: usize = 10;
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index 854068b..26da78d 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -881,13 +881,13 @@
 pub const TCIFLUSH: ::c_int = 0;
 pub const TCOFLUSH: ::c_int = 1;
 pub const TCIOFLUSH: ::c_int = 2;
-pub const NL0: ::c_int  = 0x00000000;
-pub const NL1: ::c_int  = 0x00000100;
-pub const TAB0: ::c_int = 0x00000000;
-pub const CR0: ::c_int  = 0x00000000;
-pub const FF0: ::c_int  = 0x00000000;
-pub const BS0: ::c_int  = 0x00000000;
-pub const VT0: ::c_int  = 0x00000000;
+pub const NL0: ::tcflag_t = 0x00000000;
+pub const NL1: ::tcflag_t = 0x00000100;
+pub const TAB0: ::tcflag_t = 0x00000000;
+pub const CR0: ::tcflag_t = 0x00000000;
+pub const FF0: ::tcflag_t = 0x00000000;
+pub const BS0: ::tcflag_t = 0x00000000;
+pub const VT0: ::tcflag_t = 0x00000000;
 pub const VERASE: usize = 2;
 pub const VKILL: usize = 3;
 pub const VINTR: usize = 0;
diff --git a/src/unix/uclibc/mips/mod.rs b/src/unix/uclibc/mips/mod.rs
index 27f6fe5..fa4b0cb 100644
--- a/src/unix/uclibc/mips/mod.rs
+++ b/src/unix/uclibc/mips/mod.rs
@@ -391,15 +391,15 @@
 
 pub const SIGSTKSZ: ::size_t = 8192;
 pub const CBAUD: ::tcflag_t = 0o0010017;
-pub const TAB1: ::c_int = 0x00000800;
-pub const TAB2: ::c_int = 0x00001000;
-pub const TAB3: ::c_int = 0x00001800;
-pub const CR1: ::c_int  = 0x00000200;
-pub const CR2: ::c_int  = 0x00000400;
-pub const CR3: ::c_int  = 0x00000600;
-pub const FF1: ::c_int  = 0x00008000;
-pub const BS1: ::c_int  = 0x00002000;
-pub const VT1: ::c_int  = 0x00004000;
+pub const TAB1: ::tcflag_t = 0x00000800;
+pub const TAB2: ::tcflag_t = 0x00001000;
+pub const TAB3: ::tcflag_t = 0x00001800;
+pub const CR1: ::tcflag_t = 0x00000200;
+pub const CR2: ::tcflag_t = 0x00000400;
+pub const CR3: ::tcflag_t = 0x00000600;
+pub const FF1: ::tcflag_t = 0x00008000;
+pub const BS1: ::tcflag_t = 0x00002000;
+pub const VT1: ::tcflag_t = 0x00004000;
 pub const VWERASE: usize = 14;
 pub const VREPRINT: usize = 12;
 pub const VSUSP: usize = 10;
diff --git a/src/unix/uclibc/mod.rs b/src/unix/uclibc/mod.rs
index 3fd64ca..1852d92 100644
--- a/src/unix/uclibc/mod.rs
+++ b/src/unix/uclibc/mod.rs
@@ -910,13 +910,13 @@
 pub const TCIFLUSH: ::c_int = 0;
 pub const TCOFLUSH: ::c_int = 1;
 pub const TCIOFLUSH: ::c_int = 2;
-pub const NL0: ::c_int  = 0x00000000;
-pub const NL1: ::c_int  = 0x00000100;
-pub const TAB0: ::c_int = 0x00000000;
-pub const CR0: ::c_int  = 0x00000000;
-pub const FF0: ::c_int  = 0x00000000;
-pub const BS0: ::c_int  = 0x00000000;
-pub const VT0: ::c_int  = 0x00000000;
+pub const NL0: ::tcflag_t  = 0x00000000;
+pub const NL1: ::tcflag_t  = 0x00000100;
+pub const TAB0: ::tcflag_t = 0x00000000;
+pub const CR0: ::tcflag_t  = 0x00000000;
+pub const FF0: ::tcflag_t  = 0x00000000;
+pub const BS0: ::tcflag_t  = 0x00000000;
+pub const VT0: ::tcflag_t  = 0x00000000;
 pub const VERASE: usize = 2;
 pub const VKILL: usize = 3;
 pub const VINTR: usize = 0;