diff -r 1463985435ba tools/libxl/libxl_aoutils.c
--- a/tools/libxl/libxl_aoutils.c	Wed May 16 17:17:17 2012 +0200
+++ b/tools/libxl/libxl_aoutils.c	Wed May 16 17:47:51 2012 +0200
@@ -230,8 +230,8 @@ static void openpty_exited(libxl__egc *e
 }
 
 int libxl__openptys(libxl__openpty_state *op,
-                    const struct termios *termp,
-                    const struct winsize *winp) {
+                    struct termios *termp,
+                    struct winsize *winp) {
     /*
      * This is completely crazy.  openpty calls grantpt which the spec
      * says may fork, and may not be called with a SIGCHLD handler.
diff -r 1463985435ba tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h	Wed May 16 17:17:17 2012 +0200
+++ b/tools/libxl/libxl_internal.h	Wed May 16 17:47:51 2012 +0200
@@ -1739,8 +1739,8 @@ struct libxl__openpty_result {
 };
 
 int libxl__openptys(libxl__openpty_state *op,
-                    const struct termios *termp,
-                    const struct winsize *winp);
+                    struct termios *termp,
+                    struct winsize *winp);
 
 
 /*----- bootloader -----*/