commit https://github.com/vim/vim/commit/509ce2a558e7e0c03242e32e844255af52f1c821 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Mar 11 22:52:15 2016 +0100 patch 7.4.1537 Problem: Too many feature flags for pipes, jobs and channels. Solution: Only use FEAT_JOB_CHANNEL.

--- a/src/gui.c
+++ b/src/gui.c
@@ -4949,7 +4949,7 @@ ex_gui(exarg_T *eap)
 	 * of the argument ending up after the shell prompt. */
 	msg_clr_eos_force();
 	gui_start();
-#ifdef FEAT_CHANNEL
+#ifdef FEAT_JOB_CHANNEL
 	channel_gui_register_all();
 #endif
     }