diff --git a/src/lib/libast/port/atmain.C b/src/lib/libast/port/atmain.C
deleted file mode 100644
index 1d382dd79..000000000
--- a/src/lib/libast/port/atmain.C
+++ /dev/null
@@ -1,38 +0,0 @@
-/***********************************************************************
-*                                                                      *
-*               This software is part of the ast package               *
-*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
-*          Copyright (c) 2020-2021 Contributors to ksh 93u+m           *
-*                      and is licensed under the                       *
-*                 Eclipse Public License, Version 1.0                  *
-*                    by AT&T Intellectual Property                     *
-*                                                                      *
-*                A copy of the License is available at                 *
-*          http://www.eclipse.org/org/documents/epl-v10.html           *
-*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
-*                                                                      *
-*              Information and Software Systems Research               *
-*                            AT&T Research                             *
-*                           Florham Park NJ                            *
-*                                                                      *
-*                 Glenn Fowler <gsf@research.att.com>                  *
-*                  David Korn <dgk@research.att.com>                   *
-*                   Phong Vo <kpv@research.att.com>                    *
-*                                                                      *
-***********************************************************************/
-#if ! __MVS__
-
-NoN(atmain)
-
-#else
-
-extern "C" void _ast_init();
-
-class Atmain_t
-{
-public: Atmain_t() { _ast_init(); }
-};
-
-static Atmain_t atmain();
-
-#endif