Maybe I need to move the #include to after <windows.h>?

src/syncterm/conn_conpty.c

-#if NTDDI_VERSION >= 0x0A000006
-
 #define WIN32_LEAN_AND_MEAN
 #include <stdatomic.h>
 #include <windows.h>
 #include <wincon.h>
 
+#if NTDDI_VERSION >= 0x0A000006
+
 #include "bbslist.h"
 #include "conn.h"
 #include "uifcinit.h"