diff --git a/lib/subpipe.c b/lib/subpipe.c
index 7f8e44f2..4eee4a0f 100644
--- a/lib/subpipe.c
+++ b/lib/subpipe.c
@@ -166,3 +166,8 @@ reap_subpipe (pid_t pid, char const *program)
     }
 #endif
 }
+
+void
+end_of_output_subpipe (pid_t pid, int fd[2])
+{
+}
diff --git a/lib/subpipe.h b/lib/subpipe.h
index 7b76bdae..8925823d 100644
--- a/lib/subpipe.h
+++ b/lib/subpipe.h
@@ -27,4 +27,5 @@
 
 void init_subpipe (void);
 pid_t create_subpipe (char const * const *, int[2]);
+void end_of_output_subpipe (pid_t, int[2]);
 void reap_subpipe (pid_t, char const *);