diff --git a/lib/std/c.zig b/lib/std/c.zig
index 23e586fd20..140ff011aa 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -1287,15 +1287,277 @@ pub const tc_lflag_t = switch (native_os) {
 
 pub const speed_t = switch (native_os) {
     .linux => std.os.linux.speed_t,
-    .macos, .ios, .tvos, .watchos => u64,
-    .freebsd, .kfreebsd => c_uint,
-    .netbsd => c_uint,
-    .dragonfly => c_uint,
-    .openbsd => c_uint,
-    .haiku => u8,
-    .solaris, .illumos => c_uint,
-    .emscripten => u32,
-    .wasi => c_uint,
+    .macos, .ios, .tvos, .watchos => enum(u64) {
+        B0 = 0,
+        B50 = 50,
+        B75 = 75,
+        B110 = 110,
+        B134 = 134,
+        B150 = 150,
+        B200 = 200,
+        B300 = 300,
+        B600 = 600,
+        B1200 = 1200,
+        B1800 = 1800,
+        B2400 = 2400,
+        B4800 = 4800,
+        B9600 = 9600,
+        B19200 = 19200,
+        B38400 = 38400,
+        B7200 = 7200,
+        B14400 = 14400,
+        B28800 = 28800,
+        B57600 = 57600,
+        B76800 = 76800,
+        B115200 = 115200,
+        B230400 = 230400,
+    },
+    .freebsd, .kfreebsd => enum(c_uint) {
+        B0 = 0,
+        B50 = 50,
+        B75 = 75,
+        B110 = 110,
+        B134 = 134,
+        B150 = 150,
+        B200 = 200,
+        B300 = 300,
+        B600 = 600,
+        B1200 = 1200,
+        B1800 = 1800,
+        B2400 = 2400,
+        B4800 = 4800,
+        B9600 = 9600,
+        B19200 = 19200,
+        B38400 = 38400,
+        B7200 = 7200,
+        B14400 = 14400,
+        B28800 = 28800,
+        B57600 = 57600,
+        B76800 = 76800,
+        B115200 = 115200,
+        B230400 = 230400,
+        B460800 = 460800,
+        B500000 = 500000,
+        B921600 = 921600,
+        B1000000 = 1000000,
+        B1500000 = 1500000,
+        B2000000 = 2000000,
+        B2500000 = 2500000,
+        B3000000 = 3000000,
+        B3500000 = 3500000,
+        B4000000 = 4000000,
+    },
+    .netbsd => enum(c_uint) {
+        B0 = 0,
+        B50 = 50,
+        B75 = 75,
+        B110 = 110,
+        B134 = 134,
+        B150 = 150,
+        B200 = 200,
+        B300 = 300,
+        B600 = 600,
+        B1200 = 1200,
+        B1800 = 1800,
+        B2400 = 2400,
+        B4800 = 4800,
+        B9600 = 9600,
+        B19200 = 19200,
+        B38400 = 38400,
+        B7200 = 7200,
+        B14400 = 14400,
+        B28800 = 28800,
+        B57600 = 57600,
+        B76800 = 76800,
+        B115200 = 115200,
+        B230400 = 230400,
+        B460800 = 460800,
+        B500000 = 500000,
+        B921600 = 921600,
+        B1000000 = 1000000,
+        B1500000 = 1500000,
+        B2000000 = 2000000,
+        B2500000 = 2500000,
+        B3000000 = 3000000,
+        B3500000 = 3500000,
+        B4000000 = 4000000,
+    },
+    .dragonfly => enum(c_uint) {
+        B0 = 0,
+        B50 = 50,
+        B75 = 75,
+        B110 = 110,
+        B134 = 134,
+        B150 = 150,
+        B200 = 200,
+        B300 = 300,
+        B600 = 600,
+        B1200 = 1200,
+        B1800 = 1800,
+        B2400 = 2400,
+        B4800 = 4800,
+        B9600 = 9600,
+        B19200 = 19200,
+        B38400 = 38400,
+        B7200 = 7200,
+        B14400 = 14400,
+        B28800 = 28800,
+        B57600 = 57600,
+        B76800 = 76800,
+        B115200 = 115200,
+        B230400 = 230400,
+        B460800 = 460800,
+        B921600 = 921600,
+    },
+    .openbsd => enum(c_uint) {
+        B0 = 0,
+        B50 = 50,
+        B75 = 75,
+        B110 = 110,
+        B134 = 134,
+        B150 = 150,
+        B200 = 200,
+        B300 = 300,
+        B600 = 600,
+        B1200 = 1200,
+        B1800 = 1800,
+        B2400 = 2400,
+        B4800 = 4800,
+        B9600 = 9600,
+        B19200 = 19200,
+        B38400 = 38400,
+        B7200 = 7200,
+        B14400 = 14400,
+        B28800 = 28800,
+        B57600 = 57600,
+        B76800 = 76800,
+        B115200 = 115200,
+        B230400 = 230400,
+    },
+    .haiku => enum(u8) {
+        B0 = 0x00,
+        B50 = 0x01,
+        B75 = 0x02,
+        B110 = 0x03,
+        B134 = 0x04,
+        B150 = 0x05,
+        B200 = 0x06,
+        B300 = 0x07,
+        B600 = 0x08,
+        B1200 = 0x09,
+        B1800 = 0x0A,
+        B2400 = 0x0B,
+        B4800 = 0x0C,
+        B9600 = 0x0D,
+        B19200 = 0x0E,
+        B38400 = 0x0F,
+        B57600 = 0x10,
+        B115200 = 0x11,
+        B230400 = 0x12,
+        B31250 = 0x13,
+    },
+    .solaris, .illumos => enum(c_uint) {
+        B0 = 0,
+        B50 = 1,
+        B75 = 2,
+        B110 = 3,
+        B134 = 4,
+        B150 = 5,
+        B200 = 6,
+        B300 = 7,
+        B600 = 8,
+        B1200 = 9,
+        B1800 = 10,
+        B2400 = 11,
+        B4800 = 12,
+        B9600 = 13,
+        B19200 = 14,
+        B38400 = 15,
+        B57600 = 16,
+        B76800 = 17,
+        B115200 = 18,
+        B153600 = 19,
+        B230400 = 20,
+        B307200 = 21,
+        B460800 = 22,
+        B921600 = 23,
+        B1000000 = 24,
+        B1152000 = 25,
+        B1500000 = 26,
+        B2000000 = 27,
+        B2500000 = 28,
+        B3000000 = 29,
+        B3500000 = 30,
+        B4000000 = 31,
+    },
+    .emscripten => enum(u32) {
+        B0 = 0o0000000,
+        B50 = 0o0000001,
+        B75 = 0o0000002,
+        B110 = 0o0000003,
+        B134 = 0o0000004,
+        B150 = 0o0000005,
+        B200 = 0o0000006,
+        B300 = 0o0000007,
+        B600 = 0o0000010,
+        B1200 = 0o0000011,
+        B1800 = 0o0000012,
+        B2400 = 0o0000013,
+        B4800 = 0o0000014,
+        B9600 = 0o0000015,
+        B19200 = 0o0000016,
+        B38400 = 0o0000017,
+
+        B57600 = 0o0010001,
+        B115200 = 0o0010002,
+        B230400 = 0o0010003,
+        B460800 = 0o0010004,
+        B500000 = 0o0010005,
+        B576000 = 0o0010006,
+        B921600 = 0o0010007,
+        B1000000 = 0o0010010,
+        B1152000 = 0o0010011,
+        B1500000 = 0o0010012,
+        B2000000 = 0o0010013,
+        B2500000 = 0o0010014,
+        B3000000 = 0o0010015,
+        B3500000 = 0o0010016,
+        B4000000 = 0o0010017,
+    },
+    .wasi => enum(u32) {
+        B0 = 0o0000000,
+        B50 = 0o0000001,
+        B75 = 0o0000002,
+        B110 = 0o0000003,
+        B134 = 0o0000004,
+        B150 = 0o0000005,
+        B200 = 0o0000006,
+        B300 = 0o0000007,
+        B600 = 0o0000010,
+        B1200 = 0o0000011,
+        B1800 = 0o0000012,
+        B2400 = 0o0000013,
+        B4800 = 0o0000014,
+        B9600 = 0o0000015,
+        B19200 = 0o0000016,
+        B38400 = 0o0000017,
+
+        B57600 = 0o0010001,
+        B115200 = 0o0010002,
+        B230400 = 0o0010003,
+        B460800 = 0o0010004,
+        B500000 = 0o0010005,
+        B576000 = 0o0010006,
+        B921600 = 0o0010007,
+        B1000000 = 0o0010010,
+        B1152000 = 0o0010011,
+        B1500000 = 0o0010012,
+        B2000000 = 0o0010013,
+        B2500000 = 0o0010014,
+        B3000000 = 0o0010015,
+        B3500000 = 0o0010016,
+        B4000000 = 0o0010017,
+    },
     else => @compileError("target libc does not have speed_t"),
 };
 
diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index b5c132df12..46997c5d75 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -814,43 +814,6 @@ pub const TCSA = struct {
     pub const SOFT = 0x10; // flag - don't alter h.w. state
 };
 
-// Standard speeds
-pub const B0: c_uint = 0;
-pub const B50: c_uint = 50;
-pub const B75: c_uint = 75;
-pub const B110: c_uint = 110;
-pub const B134: c_uint = 134;
-pub const B150: c_uint = 150;
-pub const B200: c_uint = 200;
-pub const B300: c_uint = 300;
-pub const B600: c_uint = 600;
-pub const B1200: c_uint = 1200;
-pub const B1800: c_uint = 1800;
-pub const B2400: c_uint = 2400;
-pub const B4800: c_uint = 4800;
-pub const B9600: c_uint = 9600;
-pub const B19200: c_uint = 19200;
-pub const B38400: c_uint = 38400;
-pub const B7200: c_uint = 7200;
-pub const B14400: c_uint = 14400;
-pub const B28800: c_uint = 28800;
-pub const B57600: c_uint = 57600;
-pub const B76800: c_uint = 76800;
-pub const B115200: c_uint = 115200;
-pub const B230400: c_uint = 230400;
-pub const B460800: c_uint = 460800;
-pub const B500000: c_uint = 500000;
-pub const B921600: c_uint = 921600;
-pub const B1000000: c_uint = 1000000;
-pub const B1500000: c_uint = 1500000;
-pub const B2000000: c_uint = 2000000;
-pub const B2500000: c_uint = 2500000;
-pub const B3000000: c_uint = 3000000;
-pub const B3500000: c_uint = 3500000;
-pub const B4000000: c_uint = 4000000;
-pub const EXTA: c_uint = 19200;
-pub const EXTB: c_uint = 38400;
-
 pub const TCIFLUSH = 1;
 pub const TCOFLUSH = 2;
 pub const TCIOFLUSH = 3;
diff --git a/lib/std/c/openbsd.zig b/lib/std/c/openbsd.zig
index 8d1df592d7..9b37aef05a 100644
--- a/lib/std/c/openbsd.zig
+++ b/lib/std/c/openbsd.zig
@@ -776,33 +776,6 @@ pub const TCSA = struct {
     pub const SOFT = 0x10; // flag - don't alter h.w. state
 };
 
-// Standard speeds
-pub const B0 = 0;
-pub const B50 = 50;
-pub const B75 = 75;
-pub const B110 = 110;
-pub const B134 = 134;
-pub const B150 = 150;
-pub const B200 = 200;
-pub const B300 = 300;
-pub const B600 = 600;
-pub const B1200 = 1200;
-pub const B1800 = 1800;
-pub const B2400 = 2400;
-pub const B4800 = 4800;
-pub const B9600 = 9600;
-pub const B19200 = 19200;
-pub const B38400 = 38400;
-pub const B7200 = 7200;
-pub const B14400 = 14400;
-pub const B28800 = 28800;
-pub const B57600 = 57600;
-pub const B76800 = 76800;
-pub const B115200 = 115200;
-pub const B230400 = 230400;
-pub const EXTA = 19200;
-pub const EXTB = 38400;
-
 pub const TCIFLUSH = 1;
 pub const TCOFLUSH = 2;
 pub const TCIOFLUSH = 3;
diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 4a3ed67cc5..6b092763d1 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -5004,45 +5004,81 @@ pub const rusage = extern struct {
     pub const THREAD = 1;
 };
 
-pub const speed_t = u32;
-
 pub const NCCS = switch (native_arch) {
     .powerpc, .powerpcle, .powerpc64, .powerpc64le => 19,
     else => 32,
 };
 
-pub const B0 = 0o0000000;
-pub const B50 = 0o0000001;
-pub const B75 = 0o0000002;
-pub const B110 = 0o0000003;
-pub const B134 = 0o0000004;
-pub const B150 = 0o0000005;
-pub const B200 = 0o0000006;
-pub const B300 = 0o0000007;
-pub const B600 = 0o0000010;
-pub const B1200 = 0o0000011;
-pub const B1800 = 0o0000012;
-pub const B2400 = 0o0000013;
-pub const B4800 = 0o0000014;
-pub const B9600 = 0o0000015;
-pub const B19200 = 0o0000016;
-pub const B38400 = 0o0000017;
-pub const BOTHER = 0o0010000;
-pub const B57600 = 0o0010001;
-pub const B115200 = 0o0010002;
-pub const B230400 = 0o0010003;
-pub const B460800 = 0o0010004;
-pub const B500000 = 0o0010005;
-pub const B576000 = 0o0010006;
-pub const B921600 = 0o0010007;
-pub const B1000000 = 0o0010010;
-pub const B1152000 = 0o0010011;
-pub const B1500000 = 0o0010012;
-pub const B2000000 = 0o0010013;
-pub const B2500000 = 0o0010014;
-pub const B3000000 = 0o0010015;
-pub const B3500000 = 0o0010016;
-pub const B4000000 = 0o0010017;
+pub const speed_t = switch (native_arch) {
+    .powerpc, .powerpcle, .powerpc64, .powerpc64le => enum(u32) {
+        B0 = 0o0000000,
+        B50 = 0o0000001,
+        B75 = 0o0000002,
+        B110 = 0o0000003,
+        B134 = 0o0000004,
+        B150 = 0o0000005,
+        B200 = 0o0000006,
+        B300 = 0o0000007,
+        B600 = 0o0000010,
+        B1200 = 0o0000011,
+        B1800 = 0o0000012,
+        B2400 = 0o0000013,
+        B4800 = 0o0000014,
+        B9600 = 0o0000015,
+        B19200 = 0o0000016,
+        B38400 = 0o0000017,
+
+        B57600 = 0o00020,
+        B115200 = 0o00021,
+        B230400 = 0o00022,
+        B460800 = 0o00023,
+        B500000 = 0o00024,
+        B576000 = 0o00025,
+        B921600 = 0o00026,
+        B1000000 = 0o00027,
+        B1152000 = 0o00030,
+        B1500000 = 0o00031,
+        B2000000 = 0o00032,
+        B2500000 = 0o00033,
+        B3000000 = 0o00034,
+        B3500000 = 0o00035,
+        B4000000 = 0o00036,
+    },
+    else => enum(u32) {
+        B0 = 0o0000000,
+        B50 = 0o0000001,
+        B75 = 0o0000002,
+        B110 = 0o0000003,
+        B134 = 0o0000004,
+        B150 = 0o0000005,
+        B200 = 0o0000006,
+        B300 = 0o0000007,
+        B600 = 0o0000010,
+        B1200 = 0o0000011,
+        B1800 = 0o0000012,
+        B2400 = 0o0000013,
+        B4800 = 0o0000014,
+        B9600 = 0o0000015,
+        B19200 = 0o0000016,
+        B38400 = 0o0000017,
+
+        B57600 = 0o0010001,
+        B115200 = 0o0010002,
+        B230400 = 0o0010003,
+        B460800 = 0o0010004,
+        B500000 = 0o0010005,
+        B576000 = 0o0010006,
+        B921600 = 0o0010007,
+        B1000000 = 0o0010010,
+        B1152000 = 0o0010011,
+        B1500000 = 0o0010012,
+        B2000000 = 0o0010013,
+        B2500000 = 0o0010014,
+        B3000000 = 0o0010015,
+        B3500000 = 0o0010016,
+        B4000000 = 0o0010017,
+    },
+};
 
 pub const tc_iflag_t = switch (native_arch) {
     .powerpc, .powerpcle, .powerpc64, .powerpc64le => packed struct(u32) {