!(prefix = strip_path_suffix(executable_dirname, GIT_EXEC_PATH)) &&
            !(prefix = strip_path_suffix(executable_dirname, BINDIR)) &&
            !(prefix = strip_path_suffix(executable_dirname, "git"))) {
-               prefix = PREFIX;
+               prefix = FALLBACK_RUNTIME_PREFIX;
                trace_printf("RUNTIME_PREFIX requested, "
                                "but prefix computation failed.  "
                                "Using static fallback '%s'.\n", prefix);
  */
 static const char *system_prefix(void)
 {
-       return PREFIX;
+       return FALLBACK_RUNTIME_PREFIX;
 }
 
 /*