EOF
# oooo annoying, pin preferences for buster-backports
+# make it low pririty for reproduceability
cat << EOF > /opt/chroot/$chrootdir/etc/apt/preferences.d/99buster-backports
Package: *
Pin: release a=buster-backports
-Pin-Priority: 900
+Pin-Priority: 300
Package: libcurl3-gnutls
Pin: version 7.64*