t / t4101 / diff.2-1on commit pre-POSIX.1-2001 systems do not have <sys/select.h> (2600973)
   1--- a/frotz
   2+++ b/frotz
   3@@ -1,2 +1,3 @@
   4 a
   5-b
   6\ No newline at end of file
   7+b
   8+c