1 diff --git i/lib/clean-temp.c w/lib/clean-temp.c
2 index 40ec02f..1053312 100644
5 @@ -582,6 +582,9 @@ static bool
6 supports_delete_on_close ()
8 static int known; /* 1 = yes, -1 = no, 0 = unknown */
9 + /* M4 wants to close and later reopen a temporary file, so
10 + delete-on-close must not be used. */