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diff --git a/tools/pre-commit b/tools/pre-commit
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+++ b/tools/pre-commit
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+#!/bin/sh
+
+# Exit with status 1 if any command below fails
+set -e
+
+# Exit if it's not a branch we're interested in being thorough about
+if echo $(git rev-parse --symbolic-full-name HEAD) | \
+    egrep -q '^refs/heads/(next|t/)'; then
+    exit 0
+fi
+
+# These are the locations I keep my temporary source and build trees in
+PRODUCTS=$(./acprep products)	# generates a build directory name such as
+                                # ~/Products/ledger
+TMPDIR=$PRODUCTS/pre-commit
+MIRROR=$PRODUCTS/pre-commit-mirror
+
+# Checkout a copy of the current index into MIRROR
+git checkout-index --prefix=$MIRROR/ -af
+
+# Remove files from MIRROR which are no longer present in the index
+git diff-index --cached --name-only --diff-filter=D -z HEAD | \
+    (cd $MIRROR && xargs -0 rm -f --)
+
+# Copy only _changed files_ from MIRROR to TMPDIR, without copying
+# timestamps.  This includes copying over new files, and deleting
+# removed ones.  This way, "make check" will only rebuild what is
+# necessary to validate the commit.
+rsync -rlpgoDOc --delete --exclude-from=tools/excludes $MIRROR/ $TMPDIR/
+
+# Everything else happens in the temporary build tree
+if [ ! -f $TMPDIR/lib/utfcpp/source/utf8.h ]; then
+    rsync -a --delete lib/utfcpp/ $TMPDIR/lib/utfcpp/
+fi
+cd $TMPDIR
+
+# Make sure there is a current Makefile.  Regeneration of Makefile
+# happens automatically, but if myacprep or acprep changes, we want to
+# regenerate everything manually.  If the user doesn't have acprep, look
+# for other common autoconf-related script files.
+if [ ! -f Makefile -o \
+     Makefile.in -nt Makefile -o \
+     configure -nt Makefile -o \
+     Makefile.am -nt Makefile.in -o \
+     configure.ac -nt configure -o \
+     \( -f acprep -a acprep -nt Makefile \) ]
+then
+    if [ -f acprep ]; then
+	./acprep default --local
+    elif [ -f autogen.sh ]; then
+	sh autogen.sh && ./configure
+    else
+	autoreconf && ./configure
+    fi
+fi
+
+# Finally, (re)build this proposed source tree and see if it passes
+# muster.
+nice -n 20 make check
+
+exit 0