Hello! The easiest way to reproduce the endless loop in the testsuite on HP-UX 10.20 without GCC is: AC_INIT _AC_COMPUTE_INT_COMPILE(foo, ac_foo) AC_OUTPUT I don't remember what exactly the bundled compiler didn't like in the expression that Autoconf wanted it to compile. I assume that compile-time calculations is something that HP supports only in the separately sold ANSI C compiler. Anyway, configure should have failed gracefully instead of going to the endless loop. Regards, Pavel Roskin