anchor.diff:    gogoclient = linux;
     grub = linux;
     grub2 = linux;
  -  gsl = linux;
     guile = linux;  # tests fail on Cygwin
     gzip = all;
     hddtemp = linux;
  
positive.code:   openssh = linux;
    openssl = all;
    pan = linux;
    par2cmdline = all;
    pciutils = linux;
    pdf2xml = all;
    perl = all;
    pkg-config = all;
    pmccabe = linux;
    procps = linux;
    python = unix; # Cygwin builds fail
    readline = all;
    rlwrap = all;
    rpm = linux;
    rpcbind = linux;
    rsync = linux;
    screen = linux ++ darwin;
    scrot = linux;
    sdparm = linux;
    sharutils = all;
    sloccount = unix; # Cygwin builds fail
    smartmontools = all;
    sqlite = unix; # Cygwin builds fail
    squid = linux;
  
negative.code:   idutils = all;
    inetutils = linux;
    iputils = linux;
    kvm = linux;
    qemu = linux;
    qemu_kvm = linux;
  