patch to enable compilation on systems that don't use glibc, such as Alpine
--- src/stty.c
+++ src/stty.c
@@ -34,6 +34,12 @@
 
 extern int errorcode;
 
+#if !defined(EXTA)
+#define EXTA B19200
+#endif
+#if !defined(EXTB)
+#define EXTB B38400
+#endif
 
 #if USE_STTY == SGTTYB