installation uses 'local' under /opt/graphite /opt/graphite/local

I run into following issue:
Debian 12 - python3 - install Graphite from scratch wit pip:
pip3 install --no-binary=:all: https://github.com/graphite-project/whisper/tarball/master
pip3 install --no-binary=:all: https://github.com/graphite-project/carbon/tarball/master
pip3 install --no-binary=:all: https://github.com/graphite-project/graphite-web/tarball/master

big part of the installation (not everything) happens under /opt/graphite/local instead of the documented /opt/graphite.
this happens for storage, conf_dir, etc..

So i changed /opt/graphite/webapp/graphite/local_settings.py
CONF_DIR = '/opt/graphite/local/conf'
STORAGE_DIR = '/opt/graphite/local/storage'
STATIC_ROOT = '/opt/graphite/local/static'
LOG_DIR = '/opt/graphite/local/storage/log/webapp'
INDEX_FILE = '/opt/graphite/local/storage/index'

But things still seem broken.
what do I miss here?

Thanks,
Tom

Start by reproducing the Debian 12 installation with the three pip3 commands in the issue and compare the resulting /opt/graphite and /opt/graphite/local paths with the documented layout. Inspect webapp/graphite/local_settings.py and the CONF_DIR, STORAGE_DIR, STATIC_ROOT, LOG_DIR, and INDEX_FILE values; done means the installation paths and configuration work consistently without the reported breakage.