--- origsrc/src/mv.c	2022-04-13 13:09:25.000000000 -0600
+++ src/src/mv.c	2022-05-08 02:06:40.887810300 -0600
@@ -91,7 +91,7 @@ rm_option_init (struct rm_options *x)
   x->require_restore_cwd = true;
 
   {
-    static struct dev_ino dev_ino_buf;
+    static struct root_dev_ino dev_ino_buf;
     x->root_dev_ino = get_root_dev_ino (&dev_ino_buf);
     if (x->root_dev_ino == NULL)
       die (EXIT_FAILURE, errno, _("failed to get attributes of %s"),
@@ -407,6 +407,16 @@ main (int argc, char **argv)
   else
     {
       char const *lastfile = file[n_files - 1];
+#if __CYGWIN__
+      struct stat s1, s2;
+      if (2 == n_files
+	  && lstat (file[0], &s1) == 0 && lstat (file[1], &s2) == 0
+	  && s1.st_ino == s2.st_ino)
+	{
+	  /* Allow 'mv foo Foo' to change case of the directory foo.  */
+	}
+      else
+#endif /* __CYGWIN__ */
       if (n_files == 2)
         x.rename_errno = (renameatu (AT_FDCWD, file[0], AT_FDCWD, lastfile,
                                      RENAME_NOREPLACE)