diff --git a/execute_cmd.c b/execute_cmd.c

--- a/execute_cmd.c

+++ b/execute_cmd.c

@@ -536,6 +536,10 @@ execute_command_internal (command, asynchronous, pipe_in, pipe_out,

   REDIRECT *my_undo_list, *exec_undo_list;

   volatile int last_pid;

   volatile int save_line_number;

+#if defined (PROCESS_SUBSTITUTION)

+  volatile int ofifo, nfifo, osize, saved_fifo;

+  volatile char *ofifo_list = NULL;

+#endif

 #if 0

   if (command == 0 || breaking || continuing || read_but_dont_execute)

@@ -681,6 +685,17 @@ execute_command_internal (command, asynchronous, pipe_in, pipe_out,

   if (shell_control_structure (command->type) && command->redirects)

     stdin_redir = stdin_redirects (command->redirects);

+#if defined (PROCESS_SUBSTITUTION)

+  if (variable_context != 0)

+    {

+      ofifo = num_fifos ();

+      ofifo_list = copy_fifo_list ((int*)&osize);

+      saved_fifo = 1;

+    }

+  else

+    saved_fifo = 0;

+#endif

+

   /* Handle WHILE FOR CASE etc. with redirections.  (Also '&' input

      redirection.)  */

   if (do_redirections (command->redirects, RX_ACTIVE|RX_UNDOABLE) != 0)

@@ -688,6 +703,9 @@ execute_command_internal (command, asynchronous, pipe_in, pipe_out,

       cleanup_redirects (redirection_undo_list);

       redirection_undo_list = (REDIRECT *)NULL;

       dispose_exec_redirects ();

+#if defined (PROCESS_SUBSTITUTION)

+      free ((void*)ofifo_list);

+#endif

       return (last_command_exit_value = EXECUTION_FAILURE);

     }

@@ -982,6 +1000,17 @@ execute_command_internal (command, asynchronous, pipe_in, pipe_out,

   if (my_undo_list || exec_undo_list)

     discard_unwind_frame ("loop_redirections");

+#if defined (PROCESS_SUBSTITUTION)

+  if (saved_fifo)

+    {

+      nfifo = num_fifos ();

+      if (nfifo > ofifo)

+       close_new_fifos ((char*)ofifo_list, osize);

+      free ((void*)ofifo_list);

+    }

+#endif

+

+

   /* Invert the return value if we have to */

   if (invert)

     exec_result = (exec_result == EXECUTION_SUCCESS)