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diff --git a/oox/source/drawingml/customshapes/README b/oox/source/drawingml/customshapes/README
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+#!/bin/bash
+
+# The Perl code here is used to generate the custom shape presets
+# source code.
+
+# This file is both a README and also, if run as a shell script, does what
+# it describes.
+
+# We want to exit on errors...
+
+set -o errexit
+
+# To re-generate the code, you need to be on Linux (I think).
+# It is not necessary to do a make test-install, just run from instdir.
+# oox needs to be build with dbglevel=2 so that DEBUG is defined.
+
+make oox.clean && make oox dbglevel=2
+
+# This reads the
+# oox/source/drawingml/customshapes/presetShapeDefinitions.xml file.
+# It will produce the file
+# oox/source/drawingml/customshapes/pptx/cshape-all.ppx and a whole
+# bunch of other files that aren't needed further.
+
+(cd oox/source/drawingml/customshapes && ./generatePresetsPPTXs.pl)
+
+
+# Then load it and store the debugging output.
+# We need only the SAL_INFO output with tag "oox.csdata", plus stderr
+# for PropertyMap::dumpData() output.
+
+SAL_LOG='+INFO.oox.csdata-WARN' instdir/program/soffice --headless --convert-to odp --outdir oox/source/drawingml/customshapes/ oox/source/drawingml/customshapes/pptx/cshape-all.pptx > oox/source/drawingml/customshapes/custom-shapes.log 2>&1
+
+
+# Now run a script that reads the above log file and generates the
+# oox-drawingml-cs-presets data:
+
+(cd oox/source/drawingml/customshapes && ./generatePresetsData.pl)
+
+
+echo
+echo "To see what has been done, run git diff --patience oox/source/drawingml"
+echo
+