diff --git a/pyconfig.h.in b/pyconfig.h.in
index a5adca1..2f14b84 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -494,6 +494,9 @@
 /* Define to 1 if you have the <sys/audioio.h> header file. */
 #undef HAVE_SYS_AUDIOIO_H
 
+/* Define to 1 if you have the <sys/bsdtty.h> header file. */
+#undef HAVE_SYS_BSDTTY_H
+
 /* Define to 1 if you have the <sys/dir.h> header file, and it defines `DIR'.
    */
 #undef HAVE_SYS_DIR_H