diff --git a/Makefile b/Makefile
index ff8b200..27360b6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+__ignored__ := $(shell ./setup.sh)
+
 # Use cargo release to manage publication and versions etc.
 #
 #   cargo install cargo-release
diff --git a/git-hooks/pre-commit b/git-hooks/pre-commit
new file mode 100755
index 0000000..ee3cd6a
--- /dev/null
+++ b/git-hooks/pre-commit
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -e
+exec 1>&2
+
+failed=
+cmp_and_fail() {
+    if ! cmp "$1" "$2"
+    then
+        failed=failed
+    fi
+}
+
+COMMAND=cmp_and_fail
+if [ "$1" = "--fix" ];
+then
+    COMMAND=cp
+fi
+
+# Ensure that various copies of cross-package data are identical.
+${COMMAND} syndicate/protocols/schema-bundle.bin syndicate-schema-plugin/schema-bundle.bin
+
+[ -z "$failed" ]
diff --git a/setup.sh b/setup.sh
new file mode 100755
index 0000000..67c08b0
--- /dev/null
+++ b/setup.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+#
+# Set up a git checkout of this repository for local dev use.
+
+exec 2>/dev/tty 1>&2
+
+set -e
+
+[ -d .git ] || exit 0
+
+for fullhook in ./git-hooks/*
+do
+    hook=$(basename "$fullhook")
+    [ -L .git/hooks/$hook ] || (
+        echo "Installing $hook hook"
+        ln -s ../../git-hooks/$hook .git/hooks/$hook
+    )
+done