First drop of package_definition, obtained from the system model used in the platform build, along with a generic SystemBuild fragment (from TB91sf)
#!/bin/sh
export SOURCE_ROOT=$PWD
export SRCROOT=$PWD
export WebCore=$PWD
export CREATE_HASH_TABLE="$SRCROOT/../JavaScriptCore/kjs/create_hash_table"
mkdir -p DerivedSources/WebCore &&
make -C DerivedSources/WebCore -f ../../DerivedSources.make