struct symbol * sym_lookup(const char *name, int flags);
struct symbol * sym_find(const char *name);
-char *sym_expand_string_value(const char *in);
const char * sym_escape_string_value(const char *in);
struct symbol ** sym_re_search(const char *pattern);
const char * sym_type_name(enum symbol_type type);
/* preprocess.c */
void env_write_dep(FILE *f, const char *auto_conf_name);
+void variable_add(const char *name, const char *value);
+void variable_all_del(void);
char *expand_string(const char *in);
char *expand_dollar(const char **str);
char *expand_one_token(const char **str);