-static struct spreadsheet_read_info *parse_spreadsheet (struct lexer *lexer);
-static void destroy_spreadsheet_read_info (struct spreadsheet_read_info *);
+
+#ifdef ODF_READ_SUPPORT
+static const bool odf_read_support = true;
+#else
+static const bool odf_read_support = false;
+struct spreadsheet *ods_probe (const char *filename, bool report_errors){}
+#endif
+
+#ifdef GNM_READ_SUPPORT
+static const bool gnm_read_support = true;
+#else
+static const bool gnm_read_support = false;
+struct spreadsheet *gnumeric_probe (const char *filename, bool report_errors){}
+#endif
+
+static bool parse_spreadsheet (struct lexer *lexer, char **filename,
+ struct spreadsheet_read_options *opts);
+
+static void destroy_spreadsheet_read_info (struct spreadsheet_read_options *);