patch 7.4.1169
Problem:    The socket I/O is intertwined with the netbeans code.
Solution:   Start refactoring the netbeans communication to split off the
            socket I/O.  Add the +channel feature.
diff --git a/src/feature.h b/src/feature.h
index 5de0fce..dd18394 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -1237,6 +1237,7 @@
  * +sniff		Sniff interface: "--enable-sniff"
  * +sun_workshop	Sun Workshop integration
  * +netbeans_intg	Netbeans integration
+ * +channel		Inter process communication
  */
 
 /*
@@ -1261,6 +1262,13 @@
 #endif
 
 /*
+ * The Channel feature requires +eval.
+ */
+#if !defined(FEAT_EVAL) && defined(FEAT_CHANNEL)
+# undef FEAT_CHANNEL
+#endif
+
+/*
  * +signs		Allow signs to be displayed to the left of text lines.
  *			Adds the ":sign" command.
  */