FTBFS libidn 1.20 on ia64

[Simon Josefsson <simon@josefsson.org>]

Hi!  I maintain libidn and noticed the following code fails on
caballero:

  fd = func ("/dev/null", O_RDONLY);
  ASSERT (0 <= fd);
  {
    char c;
    ASSERT (read (fd, &c, 1) == 0);
  }

See build log at
https://buildd.debian.org/fetch.cgi?pkg=libidn;ver=1.20-1;arch=ia64;stamp=1298994993

The test works fine on other architectures.  Is it an issue with this
particular host?  What does 'stat /dev/null' print?  Or could it
possibly be a ia64 generic issue?

/Simon