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diff --git a/intl/icu/source/data/unidata/generate.sh b/intl/icu/source/data/unidata/generate.sh
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+++ b/intl/icu/source/data/unidata/generate.sh
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+#!/bin/bash
+
+# © 2021 and later: Unicode, Inc. and others.
+# License & terms of use: http://www.unicode.org/copyright.html
+
+# This script runs Bazel to create (generate) header files and binary data files
+# with Unicode character/script/collation data that are
+# needed for bootstrapping the ICU4C build to integrate the data.
+
+# Required environment variables:
+#   - ICU_SRC - the root directory of ICU source. This directory contains the
+#               `icu4c` directory.
+
+ICU4C_COMMON=$ICU_SRC/icu4c/source/common
+ICU4C_DATA_IN=$ICU_SRC/icu4c/source/data/in
+ICU4C_NORM2=$ICU_SRC/icu4c/source/data/unidata/norm2
+
+# Delete the files from the source tree that we need to generate,
+# to make extra sure that we do not depend on their old versions for generating new ones.
+# We cannot just delete *_data.h because ucol_data.h is not a generated header file.
+rm $ICU_SRC/icu4c/source/common/norm2_nfc_data.h
+rm $ICU_SRC/icu4c/source/common/propname_data.h
+rm $ICU_SRC/icu4c/source/common/*_props_data.h
+rm $ICU4C_DATA_IN/*.icu
+rm $ICU4C_DATA_IN/*.nrm
+rm $ICU4C_DATA_IN/coll/*.icu
+# icu4c/source/i18n/collationfcd.cpp is generated by genuca;
+# probably hard to build genuca without depending on the old version.
+
+# Exit this shell script when a command fails.
+set -e
+
+# Generate normalization data files directly into the source tree.
+bazelisk run //icu4c/source/tools/gennorm2 -- -o $ICU4C_COMMON/norm2_nfc_data.h -s $ICU4C_NORM2 nfc.txt --csource
+bazelisk run //icu4c/source/tools/gennorm2 -- -o $ICU4C_DATA_IN/nfc.nrm         -s $ICU4C_NORM2 nfc.txt
+bazelisk run //icu4c/source/tools/gennorm2 -- -o $ICU4C_DATA_IN/nfkc.nrm        -s $ICU4C_NORM2 nfc.txt nfkc.txt
+bazelisk run //icu4c/source/tools/gennorm2 -- -o $ICU4C_DATA_IN/nfkc_cf.nrm     -s $ICU4C_NORM2 nfc.txt nfkc.txt nfkc_cf.txt
+bazelisk run //icu4c/source/tools/gennorm2 -- -o $ICU4C_DATA_IN/uts46.nrm       -s $ICU4C_NORM2 nfc.txt uts46.txt
+
+# genprops writes several files directly into the source tree.
+bazelisk run //tools/unicode/c/genprops $ICU_SRC/icu4c
+
+# genuca also writes several files directly into the source tree.
+# We run it twice for different versions of the CLDR root sort order.
+bazelisk run //tools/unicode/c/genuca -- --hanOrder implicit $ICU_SRC/icu4c
+bazelisk run //tools/unicode/c/genuca -- --hanOrder radical-stroke $ICU_SRC/icu4c
+# Also generate the ICU4X versions
+bazelisk run //tools/unicode/c/genuca -- --icu4x --hanOrder implicit $ICU_SRC/icu4c
+bazelisk run //tools/unicode/c/genuca -- --icu4x --hanOrder radical-stroke $ICU_SRC/icu4c