diff --git a/.gitignore b/.gitignore
index 64bdc20..bdf6477 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
 /build
 /src/*/*
 !/src/*/debian
+
+/excuses.yaml
+/rust-excuses*.*
diff --git a/dev/rust-excuses.mk b/dev/rust-excuses.mk
new file mode 100755
index 0000000..177fdf7
--- /dev/null
+++ b/dev/rust-excuses.mk
@@ -0,0 +1,26 @@
+#!/usr/bin/make -f
+# Output a nice graph of why stuff isn't yet in Debian Testing.
+#
+# Usage:
+# $ dev/rust-excuses.mk refresh all
+
+DST = rust-excuses.png rust-excuses-arch.png
+DOWNLOAD = wget -N --no-use-server-timestamps https://release.debian.org/britney/excuses.yaml
+
+all: $(DST)
+
+clean:
+	rm -rf $(DST) $(DST:%.png=%.dot) excuses.yaml
+
+excuses.yaml:
+	$(DOWNLOAD)
+
+rust-excuses.dot rust-excuses-arch.dot: excuses.yaml dev/rust-excuses.py
+	dev/rust-excuses.py rust-excuses.dot rust-excuses-arch.dot
+
+%.png: %.dot
+	dot -Tpng "$<" > "$@"
+
+refresh:
+	$(DOWNLOAD)
+.PHONY: refresh
diff --git a/dev/rust-excuses.py b/dev/rust-excuses.py
new file mode 100755
index 0000000..98b192a
--- /dev/null
+++ b/dev/rust-excuses.py
@@ -0,0 +1,40 @@
+#!/usr/bin/python3
+
+import sys
+import yaml
+
+print("parsing excuses.yaml...", file=sys.stderr)
+with open("excuses.yaml") as fp:
+	y = yaml.load(fp)
+
+excuses = {}
+for e in y["sources"]:
+	excuses[e["source"]] = e
+
+rust_excuses = open(sys.argv[1], "w")
+rust_excuses_arch = open(sys.argv[2], "w")
+
+already_seen = set()
+
+def print_all(*args, **kwargs):
+	print(*args, **kwargs, file=rust_excuses)
+	print(*args, **kwargs, file=rust_excuses_arch)
+
+def traverse(name, arch="", d=0):
+	if name in already_seen:
+		return
+	already_seen.add(name)
+	for dep in excuses.get(name, {}).get("dependencies", {}).get("migrate-after", []):
+		if "/" in dep:
+			dep, arch = dep.split("/")
+			print('"%s"' % name, "->", '"%s"' % dep, '[label="%s"]' % arch,
+				file=rust_excuses_arch)
+		else:
+			print_all('"%s"' % name, "->", '"%s"' % dep)
+		traverse(dep, arch, d+1)
+
+print_all("digraph {")
+for s in excuses.keys():
+	if s.startswith("rust-"):
+		traverse(s)
+print_all("}")