SearchPath_Add
dir = SearchPath_Add(NULL, newCurdir);
dir = SearchPath_Add(NULL, ".");
(void)SearchPath_Add(partPath, dirpath);
CachedDir *SearchPath_Add(SearchPath *, const char *);
(void)SearchPath_Add(defSysIncPath, dir);
(void)SearchPath_Add(defSysIncPath, start);
(void)SearchPath_Add(&dirSearchPath, path);
(void)SearchPath_Add(sysIncPath, found_path);
(void)SearchPath_Add(sysIncPath, argvalue);
SearchPath_Add(parseIncPath, argvalue);
(void)SearchPath_Add(ln->datum, dir);