diff --git a/pkg-deps.sh b/pkg-deps.sh
new file mode 100755
index 0000000..b181215
--- /dev/null
+++ b/pkg-deps.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+set -e
+
+mkdir -p .pkg-deps
+
+cd .pkg-deps
+
+ghc-pkg dot --global > pkgs.dot
+
+cp -p pkgs.dot pkgs.dot.orig
+
+GHC_PKGS="array base-4 base-3 bin-package-db bytestring Cabal containers directory dph extensible-exceptions filepath ghc-6.12 ghc-binary ghc-prim haskell98 hpc integer-gmp old-locale old-time pretty process random syb template-haskell time unix Win32"
+
+# ignore library packages provided by ghc
+for i in $GHC_PKGS; do sed -i -e /$i/d pkgs.dot; done
+
+cat pkgs.dot | tred | dot -Nfontsize=8 -Tsvg >pkgs.svg