Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.

--- a/examples/dsl/redirect.h	Mon May 30 23:32:56 2022 -0400
+++ b/examples/dsl/redirect.h	Mon May 30 23:46:22 2022 -0400
@@ -59,7 +59,8 @@
 // Constructors
   redirect(int h);
   redirect(int h, char *file_name, int append_flag = 0);
-  redirect(redirect &);
+  redirect(const redirect &);
+  void operator = (const redirect &);
 
 // Reset
   friend redirect &reset(redirect &e) {