Using third-party repository at scientific (set the precedence and key).

diff --git a/pbuilder/G00precedence b/pbuilder/G00precedence
new file mode 100755 (executable)
index 0000000..dc133a4
--- /dev/null
+++ b/pbuilder/G00precedence
@@ -0,0 +1,8 @@
+#! /bin/sh
+cat > /etc/apt/preferences.d/scientific <<EOF
+# at least the same priority as main OS repository
+Package: *
+Pin: origin "scientific.zcu.cz"
+Pin-Priority: 900
+EOF
+apt-key adv --keyserver subkeys.pgp.net --recv-keys 7157882F