--- socat-1.3/config.h-orig	2005-07-11 15:34:20.775808955 -0700
+++ socat-1.3/config.h	2005-07-11 15:35:43.087809148 -0700
@@ -206,7 +206,7 @@
 
 /* the offset of c_ispeed in struct termios - usable in an speed_t array.
    Applies only when HAVE_TERMIOS_ISPEED is set */
-/* #undef ISPEED_OFFSET */
+#define ISPEED_OFFSET 18
 
 /* the offset of c_ospeed in struct termios - see ISPEED_OFFSET */
 #ifdef ISPEED_OFFSET