should be it

external/duckdb/extension/icu/scripts/makedata.sh

@@ -0,0 +1,47 @@
+#! /bin/sh
+
+# ICU File Structure
+icu=https://github.com/unicode-org/icu/archive/refs/tags/release-version.zip
+zip_file=release-version.zip
+source_path=icu-release-version/icu4c/source
+data_path=$source_path"/data"
+
+#rm -rf build
+set -e
+mkdir -p build
+pushd build
+
+# download ICU 66
+code_version=66-1
+wget -nc ${icu/version/$code_version}
+unzip -o ${zip_file/version/$code_version}
+
+# download ICU 72 (replace with latest version)
+data_version=72-1
+wget -nc ${icu/version/$data_version}
+unzip -o ${zip_file/version/$data_version}
+
+# copy over the collation data
+find ${data_path/version/$data_version} -type f ! -iname "*.txt" -delete
+cp -r ${data_path/version/$data_version} ${source_path/version/$code_version}
+
+# download IANA and copy the latest Time Zone Data
+tz_version=2025b
+rm -rf icu-data
+git clone git@github.com:unicode-org/icu-data.git || true
+cp icu-data/tzdata/icunew/${tz_version}/44/*.txt ${data_path/version/$code_version}/misc
+
+# build the data, make sure to create "filters.json" first, see above
+cp ../filters.json ${source_path/version/$code_version}
+pushd ${source_path/version/$code_version}
+ICU_DATA_FILTER_FILE=filters.json ./runConfigureICU Linux --with-data-packaging=archive
+make
+popd
+
+# the data file will be located in icu-release-66-1/icu4c/source/data/out/icudt66l.dat
+# copy over the data to the minimal-icu-collation data repository
+# then run the following two commands:
+popd
+
+icudt=icudt${code_version/-[[:digit:]]/}l.dat
+python3 scripts/inline-data.py < build/${data_path/version/$code_version}/out/${icudt} > third_party/icu/stubdata/stubdata.cpp