updated for version 7.4.307
Problem:    Can't build without the +termresponse feature.
Solution:   Add proper #ifdefs.
diff --git a/src/os_unix.c b/src/os_unix.c
index 78e9914..db64fb4 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -3743,7 +3743,10 @@
     /* Conflicts with xterm mouse: "\033[" and "\033[M".
      * Also conflicts with the xterm termresponse, skip this if it was
      * requested already. */
-    if (!use_xterm_mouse() && !did_request_esc_sequence()
+    if (!use_xterm_mouse()
+#  ifdef FEAT_TERMRESPONSE
+	    && !did_request_esc_sequence()
+#  endif
 #  ifdef FEAT_GUI
 	    && !gui.in_use
 #  endif
@@ -3758,7 +3761,10 @@
 # endif
 # ifdef FEAT_MOUSE_PTERM
     /* same as the dec mouse */
-    if (!use_xterm_mouse() && !did_request_esc_sequence()
+    if (!use_xterm_mouse()
+#  ifdef FEAT_TERMRESPONSE
+	    && !did_request_esc_sequence()
+#  endif
 #  ifdef FEAT_GUI
 	    && !gui.in_use
 #  endif
@@ -3773,7 +3779,10 @@
 # endif
 # ifdef FEAT_MOUSE_URXVT
     /* same as the dec mouse */
-    if (use_xterm_mouse() == 3 && !did_request_esc_sequence()
+    if (use_xterm_mouse() == 3
+#  ifdef FEAT_TERMRESPONSE
+	    && !did_request_esc_sequence()
+#  endif
 #  ifdef FEAT_GUI
 	    && !gui.in_use
 #  endif