updated for version 7.3.343
Problem:    No mouse support for urxvt.
Solution:   Implement urxvt mouse support, also for > 252 columns.  (Yiding
            Jia)
diff --git a/src/feature.h b/src/feature.h
index 2fdd901..6d5387e 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -1053,6 +1053,9 @@
 # ifdef FEAT_BIG
 #  define FEAT_MOUSE_DEC
 # endif
+# ifdef FEAT_BIG
+#  define FEAT_MOUSE_URXVT
+# endif
 # if defined(FEAT_NORMAL) && (defined(MSDOS) || defined(WIN3264))
 #  define DOS_MOUSE
 # endif
@@ -1068,13 +1071,23 @@
 #if defined(FEAT_NORMAL) && defined(HAVE_SYSMOUSE)
 # define FEAT_SYSMOUSE
 #endif
+
+/* urxvt is a small variation of mouse_xterm, and shares its code */
+#if defined(FEAT_MOUSE_URXVT) && !defined(FEAT_MOUSE_XTERM)
+# define FEAT_MOUSE_XTERM
+#endif
+
 /* Define FEAT_MOUSE when any of the above is defined or FEAT_GUI. */
 #if !defined(FEAT_MOUSE_TTY) \
 	&& (defined(FEAT_MOUSE_XTERM) \
-	    || defined(FEAT_MOUSE_NET) || defined(FEAT_MOUSE_DEC) \
-	    || defined(DOS_MOUSE) || defined(FEAT_MOUSE_GPM) \
-	    || defined(FEAT_MOUSE_JSB) || defined(FEAT_MOUSE_PTERM) \
-	    || defined(FEAT_SYSMOUSE))
+	    || defined(FEAT_MOUSE_NET) \
+	    || defined(FEAT_MOUSE_DEC) \
+	    || defined(DOS_MOUSE) \
+	    || defined(FEAT_MOUSE_GPM) \
+	    || defined(FEAT_MOUSE_JSB) \
+	    || defined(FEAT_MOUSE_PTERM) \
+	    || defined(FEAT_SYSMOUSE) \
+	    || defined(FEAT_MOUSE_URXVT))
 # define FEAT_MOUSE_TTY		/* include non-GUI mouse support */
 #endif
 #if !defined(FEAT_MOUSE) && (defined(FEAT_MOUSE_TTY) || defined(FEAT_GUI))