act is zero. This might possibly cause an infinite delay (ie, lockup)
if things go badly wrong *and* a really unlikely race happens.
* Test suite `lines of syscall left' value is correct; !0 is failure.
+ * If we get a referral, don't also always complain falsely about RD==0.
Portability fixes:
* install-sh (from autoconf 2.12 Debian r13) included.