configure determines that my HP-UX 11.00 box has pread (and pwrite) because the
linker resolves them to symbols in my libc.
however, i don't believe that this system call is implemented in my version
of the kernel because smbd dies with a SIGSYS (bad arg
to sys call) in libc:pread.
my workaround was to override what configure automatically determines
ac_cv_func_pread=no \
ac_cv_func_pread64=no \
ac_cv_func_pwrite=no \
ac_cv_func_pwrite64=no \
./configure
i don't know if your configure scripts can be improved to automatically take
care of this or not.
in any case, this may be useful information to someone.
