patch 7.4.1537
Problem:    Too many feature flags for pipes, jobs and channels.
Solution:   Only use FEAT_JOB_CHANNEL.
diff --git a/src/configure.in b/src/configure.in
index b618b8c..f29b62c 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -2014,7 +2014,7 @@
   AC_SUBST(NETBEANS_OBJ)
 fi
 if test "$enable_channel" = "yes"; then
-  AC_DEFINE(FEAT_CHANNEL)
+  AC_DEFINE(FEAT_JOB_CHANNEL)
   CHANNEL_SRC="channel.c"
   AC_SUBST(CHANNEL_SRC)
   CHANNEL_OBJ="objects/channel.o"