--- XFree86-4.0.1/xc/programs/Xserver/hw/xfree86/os-support/xf86_OSlib.h.old	Sat Jun 24 20:20:42 2000
+++ XFree86-4.0.1/xc/programs/Xserver/hw/xfree86/os-support/xf86_OSlib.h	Sat Sep 30 23:36:30 2000
@@ -379,6 +379,7 @@
 # define LDNMAP LDSMAP
 
 # define CLEARDTR_SUPPORT
+# define CLEARRTS_SUPPORT
 # define USE_VT_SYSREQ
 
 # define POSIX_TTY