+# - COMPAT=/DAUTO_WINSOCK
+# Causes PuTTY to assume that <windows.h> includes its own WinSock
+# header file, so that it won't try to include <winsock.h>.
+#
+# - COMPAT=/DWINSOCK_TWO
+# Causes the PuTTY utilities to include <winsock2.h> instead of
+# <winsock.h>, except Plink which _needs_ WinSock 2 so it already
+# does this.