1 files changed, 0 insertions, 55 deletions
diff --git a/gnulib-m4/dup.m4 b/gnulib-m4/dup.m4
deleted file mode 100644
index b3d74d68..00000000
--- a/gnulib-m4/dup.m4
+++ /dev/null
@@ -1,55 +0,0 @@
-# dup.m4
-# serial 8
-dnl Copyright (C) 2011-2024 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-AC_DEFUN([gl_FUNC_DUP],
-[
-  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
-  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
-  m4_ifdef([gl_MSVC_INVAL], [
-    AC_REQUIRE([gl_MSVC_INVAL])
-    if test $HAVE_MSVC_INVALID_PARAMETER_HANDLER = 1; then
-      REPLACE_DUP=1
-    fi
-  ])
-  dnl Replace dup() for supporting the gnulib-defined fchdir() function,
-  dnl to keep fchdir's bookkeeping up-to-date.
-  m4_ifdef([gl_FUNC_FCHDIR], [
-    gl_TEST_FCHDIR
-    if test $HAVE_FCHDIR = 0; then
-      REPLACE_DUP=1
-    fi
-  ])
-  AC_CACHE_CHECK([whether dup works], [gl_cv_func_dup_works],
-    [AC_RUN_IFELSE(
-      [AC_LANG_PROGRAM([[#include <unistd.h>
-                         #include <fcntl.h>
-                         #include <errno.h>
-                       ]GL_MDA_DEFINES],
-         [[/* On OS/2 kLIBC, dup does not work on a directory fd.  */
-           int fd = open (".", O_RDONLY);
-           return fd < 0 ? 1 : dup (fd) < 0 ? 2 : 0;
-         ]])
-      ],
-      [gl_cv_func_dup_works=yes],
-      [gl_cv_func_dup_works=no],
-      [case "$host_os" in
-                            # Guess no on native Windows.
-         mingw* | windows*) gl_cv_func_dup_works="guessing no" ;;
-         *)                 gl_cv_func_dup_works="guessing yes" ;;
-       esac
-      ])
-    ])
-  case "$gl_cv_func_dup_works" in
-    *yes) ;;
-    *)
-      REPLACE_DUP=1
-      ;;
-  esac
-])
-
-# Prerequisites of lib/dup.c.
-AC_DEFUN([gl_PREREQ_DUP], [:])