+/* Symbol prefix specified with -p, or 0 if no -p. */
+extern const char *spec_name_prefix;
+
+/* File name prefix specified with -b, or 0 if no -b. */
+extern char const *spec_file_prefix;
+
+/* --verbose. */
+extern char *spec_verbose_file;
+
+/* File name specified for the output graph. */
+extern char *spec_graph_file;
+
+/* File name specified for the xml output. */
+extern char *spec_xml_file;
+
+/* File name specified with --defines. */
+extern char *spec_defines_file;
+
+/* Directory prefix of output file names. */
+extern char *dir_prefix;
+
+/* The file name as given on the command line.
+ Not named "input_file" because Flex uses this name for an argument,
+ and therefore GCC warns about a name clash. */
+extern uniqstr grammar_file;
+
+/* The current file name. Might change with %include, or with #line. */
+extern uniqstr current_file;