diff --git a/libc/calls/ttydefaults.h b/libc/calls/ttydefaults.h
index e17a31c34..6fc8e3877 100644
--- a/libc/calls/ttydefaults.h
+++ b/libc/calls/ttydefaults.h
@@ -7,7 +7,7 @@
 #define TTYDEF_OFLAG (OPOST | ONLCR | XTABS)
 #define TTYDEF_LFLAG (ECHO | ICANON | ISIG | IEXTEN | ECHOE | ECHOKE | ECHOCTL)
 #define TTYDEF_CFLAG (CREAD | CS8 | HUPCL)
-#define TTYDEF_SPEED (B9600)
+#define TTYDEF_SPEED (__B9600)
 
 #define CTRL(x)  ((x) ^ 0100)
 #define CEOF     CTRL('D')
diff --git a/libc/sysv/consts/B0.S b/libc/sysv/consts/B0.S
index 10c881343..0629d0223 100644
--- a/libc/sysv/consts/B0.S
+++ b/libc/sysv/consts/B0.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B0,0,0,0,0,0,0
+.syscon baud,__B0,0,0,0,0,0,0
diff --git a/libc/sysv/consts/B1000000.S b/libc/sysv/consts/B1000000.S
index a9df538cc..8cec8abca 100644
--- a/libc/sysv/consts/B1000000.S
+++ b/libc/sysv/consts/B1000000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B1000000,0x1008,0,0,0,0,0
+.syscon baud,__B1000000,0x1008,0,0,0,0,0
diff --git a/libc/sysv/consts/B110.S b/libc/sysv/consts/B110.S
index f881e71c4..28c4738a0 100644
--- a/libc/sysv/consts/B110.S
+++ b/libc/sysv/consts/B110.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B110,3,110,110,110,110,0
+.syscon baud,__B110,3,110,110,110,110,0
diff --git a/libc/sysv/consts/B115200.S b/libc/sysv/consts/B115200.S
index 03754110b..d6e0ca47d 100644
--- a/libc/sysv/consts/B115200.S
+++ b/libc/sysv/consts/B115200.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B115200,0x1002,0x01c200,0x01c200,0x01c200,0x01c200,0
+.syscon baud,__B115200,0x1002,0x01c200,0x01c200,0x01c200,0x01c200,0
diff --git a/libc/sysv/consts/B1152000.S b/libc/sysv/consts/B1152000.S
index a51390a4e..6816daae6 100644
--- a/libc/sysv/consts/B1152000.S
+++ b/libc/sysv/consts/B1152000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B1152000,0x1009,0,0,0,0,0
+.syscon baud,__B1152000,0x1009,0,0,0,0,0
diff --git a/libc/sysv/consts/B1200.S b/libc/sysv/consts/B1200.S
index 4aadfb7fa..2ed8db826 100644
--- a/libc/sysv/consts/B1200.S
+++ b/libc/sysv/consts/B1200.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B1200,9,0x04b0,0x04b0,0x04b0,0x04b0,0
+.syscon baud,__B1200,9,0x04b0,0x04b0,0x04b0,0x04b0,0
diff --git a/libc/sysv/consts/B134.S b/libc/sysv/consts/B134.S
index 72abd7770..81937a1ea 100644
--- a/libc/sysv/consts/B134.S
+++ b/libc/sysv/consts/B134.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B134,4,134,134,134,134,0
+.syscon baud,__B134,4,134,134,134,134,0
diff --git a/libc/sysv/consts/B150.S b/libc/sysv/consts/B150.S
index e4551c9cf..b4bb4153c 100644
--- a/libc/sysv/consts/B150.S
+++ b/libc/sysv/consts/B150.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B150,5,150,150,150,150,0
+.syscon baud,__B150,5,150,150,150,150,0
diff --git a/libc/sysv/consts/B1500000.S b/libc/sysv/consts/B1500000.S
index de0391547..5f6e66e8d 100644
--- a/libc/sysv/consts/B1500000.S
+++ b/libc/sysv/consts/B1500000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B1500000,0x100a,0,0,0,0,0
+.syscon baud,__B1500000,0x100a,0,0,0,0,0
diff --git a/libc/sysv/consts/B1800.S b/libc/sysv/consts/B1800.S
index 594d187ac..a0b097621 100644
--- a/libc/sysv/consts/B1800.S
+++ b/libc/sysv/consts/B1800.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B1800,10,0x0708,0x0708,0x0708,0x0708,0
+.syscon baud,__B1800,10,0x0708,0x0708,0x0708,0x0708,0
diff --git a/libc/sysv/consts/B19200.S b/libc/sysv/consts/B19200.S
index 1f1a7dbf9..82e55a190 100644
--- a/libc/sysv/consts/B19200.S
+++ b/libc/sysv/consts/B19200.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B19200,14,0x4b00,0x4b00,0x4b00,0x4b00,0
+.syscon baud,__B19200,14,0x4b00,0x4b00,0x4b00,0x4b00,0
diff --git a/libc/sysv/consts/B200.S b/libc/sysv/consts/B200.S
index e0f2164d5..2a28ba635 100644
--- a/libc/sysv/consts/B200.S
+++ b/libc/sysv/consts/B200.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B200,6,200,200,200,200,0
+.syscon baud,__B200,6,200,200,200,200,0
diff --git a/libc/sysv/consts/B2000000.S b/libc/sysv/consts/B2000000.S
index 1669832a1..bfd374c02 100644
--- a/libc/sysv/consts/B2000000.S
+++ b/libc/sysv/consts/B2000000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B2000000,0x100b,0,0,0,0,0
+.syscon baud,__B2000000,0x100b,0,0,0,0,0
diff --git a/libc/sysv/consts/B230400.S b/libc/sysv/consts/B230400.S
index c44512297..0aa7c15e1 100644
--- a/libc/sysv/consts/B230400.S
+++ b/libc/sysv/consts/B230400.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B230400,0x1003,0x038400,0x038400,0x038400,0x038400,0
+.syscon baud,__B230400,0x1003,0x038400,0x038400,0x038400,0x038400,0
diff --git a/libc/sysv/consts/B2400.S b/libc/sysv/consts/B2400.S
index 5ba9c3019..edb4a68f9 100644
--- a/libc/sysv/consts/B2400.S
+++ b/libc/sysv/consts/B2400.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B2400,11,0x0960,0x0960,0x0960,0x0960,0
+.syscon baud,__B2400,11,0x0960,0x0960,0x0960,0x0960,0
diff --git a/libc/sysv/consts/B2500000.S b/libc/sysv/consts/B2500000.S
index 398957ecb..c1ab2403b 100644
--- a/libc/sysv/consts/B2500000.S
+++ b/libc/sysv/consts/B2500000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B2500000,0x100c,0,0,0,0,0
+.syscon baud,__B2500000,0x100c,0,0,0,0,0
diff --git a/libc/sysv/consts/B300.S b/libc/sysv/consts/B300.S
index 4eb78fd3b..cae762874 100644
--- a/libc/sysv/consts/B300.S
+++ b/libc/sysv/consts/B300.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B300,7,300,300,300,300,0
+.syscon baud,__B300,7,300,300,300,300,0
diff --git a/libc/sysv/consts/B3000000.S b/libc/sysv/consts/B3000000.S
index 46aa04775..c066983fb 100644
--- a/libc/sysv/consts/B3000000.S
+++ b/libc/sysv/consts/B3000000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B3000000,0x100d,0,0,0,0,0
+.syscon baud,__B3000000,0x100d,0,0,0,0,0
diff --git a/libc/sysv/consts/B3500000.S b/libc/sysv/consts/B3500000.S
index c4a88b813..e2bcd6f56 100644
--- a/libc/sysv/consts/B3500000.S
+++ b/libc/sysv/consts/B3500000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B3500000,0x100e,0,0,0,0,0
+.syscon baud,__B3500000,0x100e,0,0,0,0,0
diff --git a/libc/sysv/consts/B38400.S b/libc/sysv/consts/B38400.S
index 2b89d8327..1c74b7c45 100644
--- a/libc/sysv/consts/B38400.S
+++ b/libc/sysv/consts/B38400.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B38400,15,0x9600,0x9600,0x9600,0x9600,0
+.syscon baud,__B38400,15,0x9600,0x9600,0x9600,0x9600,0
diff --git a/libc/sysv/consts/B4000000.S b/libc/sysv/consts/B4000000.S
index 53d35ce59..d1afa46f5 100644
--- a/libc/sysv/consts/B4000000.S
+++ b/libc/sysv/consts/B4000000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B4000000,0x100f,0,0,0,0,0
+.syscon baud,__B4000000,0x100f,0,0,0,0,0
diff --git a/libc/sysv/consts/B4800.S b/libc/sysv/consts/B4800.S
index 3ec42ec1c..310dc96d4 100644
--- a/libc/sysv/consts/B4800.S
+++ b/libc/sysv/consts/B4800.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B4800,12,0x12c0,0x12c0,0x12c0,0x12c0,0
+.syscon baud,__B4800,12,0x12c0,0x12c0,0x12c0,0x12c0,0
diff --git a/libc/sysv/consts/B50.S b/libc/sysv/consts/B50.S
index f226f4ac5..660ef7742 100644
--- a/libc/sysv/consts/B50.S
+++ b/libc/sysv/consts/B50.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B50,1,50,50,50,50,0
+.syscon baud,__B50,1,50,50,50,50,0
diff --git a/libc/sysv/consts/B500000.S b/libc/sysv/consts/B500000.S
index ce55ea22f..a46fcabcd 100644
--- a/libc/sysv/consts/B500000.S
+++ b/libc/sysv/consts/B500000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B500000,0x1005,0,0,0,0,0
+.syscon baud,__B500000,0x1005,0,0,0,0,0
diff --git a/libc/sysv/consts/B57600.S b/libc/sysv/consts/B57600.S
index c24db80ed..1dc1ccfde 100644
--- a/libc/sysv/consts/B57600.S
+++ b/libc/sysv/consts/B57600.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B57600,0x1001,0xe100,0xe100,0xe100,0xe100,0
+.syscon baud,__B57600,0x1001,0xe100,0xe100,0xe100,0xe100,0
diff --git a/libc/sysv/consts/B576000.S b/libc/sysv/consts/B576000.S
index 4e71a6635..444cebe1a 100644
--- a/libc/sysv/consts/B576000.S
+++ b/libc/sysv/consts/B576000.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B576000,0x1006,0,0,0,0,0
+.syscon baud,__B576000,0x1006,0,0,0,0,0
diff --git a/libc/sysv/consts/B600.S b/libc/sysv/consts/B600.S
index 86ae31586..0dcb05cf6 100644
--- a/libc/sysv/consts/B600.S
+++ b/libc/sysv/consts/B600.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B600,8,600,600,600,600,0
+.syscon baud,__B600,8,600,600,600,600,0
diff --git a/libc/sysv/consts/B75.S b/libc/sysv/consts/B75.S
index 0935d33ad..094e2876e 100644
--- a/libc/sysv/consts/B75.S
+++ b/libc/sysv/consts/B75.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B75,2,75,75,75,75,0
+.syscon baud,__B75,2,75,75,75,75,0
diff --git a/libc/sysv/consts/B9600.S b/libc/sysv/consts/B9600.S
index 47bc775bd..90d347c9d 100644
--- a/libc/sysv/consts/B9600.S
+++ b/libc/sysv/consts/B9600.S
@@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon baud,B9600,13,0x2580,0x2580,0x2580,0x2580,0
+.syscon baud,__B9600,13,0x2580,0x2580,0x2580,0x2580,0
diff --git a/libc/sysv/consts/baud.h b/libc/sysv/consts/baud.h
index d4e2e8326..bb0feeb88 100644
--- a/libc/sysv/consts/baud.h
+++ b/libc/sysv/consts/baud.h
@@ -4,67 +4,67 @@
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 COSMOPOLITAN_C_START_
 
-extern const long B0;
-extern const long B50;
-extern const long B75;
-extern const long B110;
-extern const long B134;
-extern const long B150;
-extern const long B200;
-extern const long B300;
-extern const long B600;
-extern const long B1200;
-extern const long B1800;
-extern const long B2400;
-extern const long B4800;
-extern const long B9600;
-extern const long B19200;
-extern const long B38400;
-extern const long B57600;
-extern const long B115200;
-extern const long B230400;
-extern const long B500000;
-extern const long B576000;
-extern const long B1000000;
-extern const long B1152000;
-extern const long B1500000;
-extern const long B2000000;
-extern const long B2500000;
-extern const long B3000000;
-extern const long B3500000;
-extern const long B4000000;
+extern const long __B0;
+extern const long __B50;
+extern const long __B75;
+extern const long __B110;
+extern const long __B134;
+extern const long __B150;
+extern const long __B200;
+extern const long __B300;
+extern const long __B600;
+extern const long __B1200;
+extern const long __B1800;
+extern const long __B2400;
+extern const long __B4800;
+extern const long __B9600;
+extern const long __B19200;
+extern const long __B38400;
+extern const long __B57600;
+extern const long __B115200;
+extern const long __B230400;
+extern const long __B500000;
+extern const long __B576000;
+extern const long __B1000000;
+extern const long __B1152000;
+extern const long __B1500000;
+extern const long __B2000000;
+extern const long __B2500000;
+extern const long __B3000000;
+extern const long __B3500000;
+extern const long __B4000000;
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 
-#define B0       LITERALLY(0)
-#define B50      SYMBOLIC(B50)
-#define B75      SYMBOLIC(B75)
-#define B110     SYMBOLIC(B110)
-#define B134     SYMBOLIC(B134)
-#define B150     SYMBOLIC(B150)
-#define B200     SYMBOLIC(B200)
-#define B300     SYMBOLIC(B300)
-#define B600     SYMBOLIC(B600)
-#define B1200    SYMBOLIC(B1200)
-#define B1800    SYMBOLIC(B1800)
-#define B2400    SYMBOLIC(B2400)
-#define B4800    SYMBOLIC(B4800)
-#define B9600    SYMBOLIC(B9600)
-#define B19200   SYMBOLIC(B19200)
-#define B38400   SYMBOLIC(B38400)
-#define B57600   SYMBOLIC(B57600)
-#define B115200  SYMBOLIC(B115200)
-#define B230400  SYMBOLIC(B230400)
-#define B500000  SYMBOLIC(B500000)
-#define B576000  SYMBOLIC(B576000)
-#define B1000000 SYMBOLIC(B1000000)
-#define B1152000 SYMBOLIC(B1152000)
-#define B1500000 SYMBOLIC(B1500000)
-#define B2000000 SYMBOLIC(B2000000)
-#define B2500000 SYMBOLIC(B2500000)
-#define B3000000 SYMBOLIC(B3000000)
-#define B3500000 SYMBOLIC(B3500000)
-#define B4000000 SYMBOLIC(B4000000)
+#define __B0       LITERALLY(0)
+#define __B50      SYMBOLIC(__B50)
+#define __B75      SYMBOLIC(__B75)
+#define __B110     SYMBOLIC(__B110)
+#define __B134     SYMBOLIC(__B134)
+#define __B150     SYMBOLIC(__B150)
+#define __B200     SYMBOLIC(__B200)
+#define __B300     SYMBOLIC(__B300)
+#define __B600     SYMBOLIC(__B600)
+#define __B1200    SYMBOLIC(__B1200)
+#define __B1800    SYMBOLIC(__B1800)
+#define __B2400    SYMBOLIC(__B2400)
+#define __B4800    SYMBOLIC(__B4800)
+#define __B9600    SYMBOLIC(__B9600)
+#define __B19200   SYMBOLIC(__B19200)
+#define __B38400   SYMBOLIC(__B38400)
+#define __B57600   SYMBOLIC(__B57600)
+#define __B115200  SYMBOLIC(__B115200)
+#define __B230400  SYMBOLIC(__B230400)
+#define __B500000  SYMBOLIC(__B500000)
+#define __B576000  SYMBOLIC(__B576000)
+#define __B1000000 SYMBOLIC(__B1000000)
+#define __B1152000 SYMBOLIC(__B1152000)
+#define __B1500000 SYMBOLIC(__B1500000)
+#define __B2000000 SYMBOLIC(__B2000000)
+#define __B2500000 SYMBOLIC(__B2500000)
+#define __B3000000 SYMBOLIC(__B3000000)
+#define __B3500000 SYMBOLIC(__B3500000)
+#define __B4000000 SYMBOLIC(__B4000000)
 
 #endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_BAUD_H_ */
diff --git a/third_party/python/Modules/termios.c b/third_party/python/Modules/termios.c
index 31a9a09ba..2bab06a72 100644
--- a/third_party/python/Modules/termios.c
+++ b/third_party/python/Modules/termios.c
@@ -545,34 +545,34 @@ PyInit_termios(void)
     Py_INCREF(TermiosError);
     PyModule_AddObject(m, "error", TermiosError);
 
-    if (B50) PyModule_AddIntConstant(m, "B50", B50);
-    if (B75) PyModule_AddIntConstant(m, "B75", B75);
-    if (B110) PyModule_AddIntConstant(m, "B110", B110);
-    if (B134) PyModule_AddIntConstant(m, "B134", B134);
-    if (B150) PyModule_AddIntConstant(m, "B150", B150);
-    if (B200) PyModule_AddIntConstant(m, "B200", B200);
-    if (B300) PyModule_AddIntConstant(m, "B300", B300);
-    if (B600) PyModule_AddIntConstant(m, "B600", B600);
-    if (B1200) PyModule_AddIntConstant(m, "B1200", B1200);
-    if (B1800) PyModule_AddIntConstant(m, "B1800", B1800);
-    if (B2400) PyModule_AddIntConstant(m, "B2400", B2400);
-    if (B4800) PyModule_AddIntConstant(m, "B4800", B4800);
-    if (B9600) PyModule_AddIntConstant(m, "B9600", B9600);
-    if (B19200) PyModule_AddIntConstant(m, "B19200", B19200);
-    if (B38400) PyModule_AddIntConstant(m, "B38400", B38400);
-    if (B57600) PyModule_AddIntConstant(m, "B57600", B57600);
-    if (B115200) PyModule_AddIntConstant(m, "B115200", B115200);
-    if (B230400) PyModule_AddIntConstant(m, "B230400", B230400);
-    if (B500000) PyModule_AddIntConstant(m, "B500000", B500000);
-    if (B576000) PyModule_AddIntConstant(m, "B576000", B576000);
-    if (B1000000) PyModule_AddIntConstant(m, "B1000000", B1000000);
-    if (B1152000) PyModule_AddIntConstant(m, "B1152000", B1152000);
-    if (B1500000) PyModule_AddIntConstant(m, "B1500000", B1500000);
-    if (B2000000) PyModule_AddIntConstant(m, "B2000000", B2000000);
-    if (B2500000) PyModule_AddIntConstant(m, "B2500000", B2500000);
-    if (B3000000) PyModule_AddIntConstant(m, "B3000000", B3000000);
-    if (B3500000) PyModule_AddIntConstant(m, "B3500000", B3500000);
-    if (B4000000) PyModule_AddIntConstant(m, "B4000000", B4000000);
+    if (__B50) PyModule_AddIntConstant(m, "B50", __B50);
+    if (__B75) PyModule_AddIntConstant(m, "B75", __B75);
+    if (__B110) PyModule_AddIntConstant(m, "B110", __B110);
+    if (__B134) PyModule_AddIntConstant(m, "B134", __B134);
+    if (__B150) PyModule_AddIntConstant(m, "B150", __B150);
+    if (__B200) PyModule_AddIntConstant(m, "B200", __B200);
+    if (__B300) PyModule_AddIntConstant(m, "B300", __B300);
+    if (__B600) PyModule_AddIntConstant(m, "B600", __B600);
+    if (__B1200) PyModule_AddIntConstant(m, "B1200", __B1200);
+    if (__B1800) PyModule_AddIntConstant(m, "B1800", __B1800);
+    if (__B2400) PyModule_AddIntConstant(m, "B2400", __B2400);
+    if (__B4800) PyModule_AddIntConstant(m, "B4800", __B4800);
+    if (__B9600) PyModule_AddIntConstant(m, "B9600", __B9600);
+    if (__B19200) PyModule_AddIntConstant(m, "B19200", __B19200);
+    if (__B38400) PyModule_AddIntConstant(m, "B38400", __B38400);
+    if (__B57600) PyModule_AddIntConstant(m, "B57600", __B57600);
+    if (__B115200) PyModule_AddIntConstant(m, "B115200", __B115200);
+    if (__B230400) PyModule_AddIntConstant(m, "B230400", __B230400);
+    if (__B500000) PyModule_AddIntConstant(m, "B500000", __B500000);
+    if (__B576000) PyModule_AddIntConstant(m, "B576000", __B576000);
+    if (__B1000000) PyModule_AddIntConstant(m, "B1000000", __B1000000);
+    if (__B1152000) PyModule_AddIntConstant(m, "B1152000", __B1152000);
+    if (__B1500000) PyModule_AddIntConstant(m, "B1500000", __B1500000);
+    if (__B2000000) PyModule_AddIntConstant(m, "B2000000", __B2000000);
+    if (__B2500000) PyModule_AddIntConstant(m, "B2500000", __B2500000);
+    if (__B3000000) PyModule_AddIntConstant(m, "B3000000", __B3000000);
+    if (__B3500000) PyModule_AddIntConstant(m, "B3500000", __B3500000);
+    if (__B4000000) PyModule_AddIntConstant(m, "B4000000", __B4000000);
     if (CBAUDEX) PyModule_AddIntConstant(m, "CBAUDEX", CBAUDEX);
     /* TODO(jart): B460800 */
     /* TODO(jart): B921600 */