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Check for xextproto 7.1.1 and include headers for X_ShmAttach.

https://sourceforge.net/tracker/?func=detail&aid=2935150&group_id=223021&atid=1057617
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=0a4c4c5fe8ebad2dd13f5770bd90a194eebb2890

--- configure.in
+++ configure.in
@@ -2192,6 +2192,11 @@
                  [ X_LIBS="-lXext $X_LIBS";
                    LINK_X_LIBS="-lXext $LINK_X_LIBS"],,$X_LIBS)
 
+    PKG_CHECK_MODULES(XEXT, [xextproto >= 7.0.99.1],
+                 HAVE_XEXTPROTO_71="yes"; AC_DEFINE(HAVE_XEXTPROTO_71, 1, [xextproto 7.1 available]),
+    		 HAVE_XEXTPROTO_71="no")
+    AM_CONDITIONAL(HAVE_XEXTPROTO_71, [ test "$HAVE_XEXTPROTO_71" = "yes" ])
+
     AC_MSG_CHECKING(for X11/extensions/Xvlib.h)
     AC_TRY_LINK([#include <X11/Xlib.h>
                  #include <X11/extensions/Xvlib.h>],
--- src/arch/unix/x11/xaw/x11video.c
+++ src/arch/unix/x11/xaw/x11video.c
@@ -56,6 +56,7 @@
 #include "vice.h"
 
 #include <X11/Xlib.h>
+#include <X11/Xlibint.h>
 #include <X11/Xutil.h>
 #include <X11/Intrinsic.h>
 #include <X11/cursorfont.h>
@@ -95,6 +96,10 @@
 #endif
 
 #ifdef USE_MITSHM
+#ifdef HAVE_XEXTPROTO_71
+#include <X11/extensions/shmproto.h>
+#include <X11/extensions/XShm.h>
+#endif
 extern int shmhandler(Display* display, XErrorEvent* err);
 extern int mitshm_failed; /* will be set to true if XShmAttach() failed */
 extern int shmmajor;          /* major number of MITSHM error codes */