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+SYNOPSIS
+        mixed include_file (string file, string compiled_file, int sys_include)
+
+DESCRIPTION
+        Generate the pathname of an included file.
+
+        Arguments:
+          previous_object(): The object causing the compile.
+          file             : The name given in the #include directive.
+          compiled_file    : The object file which is just compiled.
+                             (compat: name given without leading "/")
+          sys_include      : TRUE for #include <> directives.
+
+        Result:
+          0: use the normal include filename generation (""-includes are
+             used as they are, <>-includes are handled according to
+             H_INCLUDE_DIRS).
+
+          <path>: the full absolute pathname of the file to include,
+                  without parentdir parts ("/../"). Leading slashes ("/")
+                  may be omitted.
+
+          else: The include directive is not legal.
+
+        If the function does not generate a valid pathname, the driver
+        will next try to resolve the include using the H_INCLUDE_DIRS hook.
+
+HISTORY
+        Introduced in LDMud 3.2.8.
+
+SEE ALSO
+        hooks(C), inherit_file(M), include_dirs(H)