Python 3.9.6 (default, Mar 29 2024, 10:51:09)
[Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ROOT
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/laurent/github.com/root-project/install-2/lib/root/ROOT/__init__.py", line 25, in <module>
    import cppyy
  File "/Users/laurent/github.com/root-project/install-2/lib/root/cppyy/__init__.py", line 81, in <module>
    from ._cpython_cppyy import *
  File "/Users/laurent/github.com/root-project/install-2/lib/root/cppyy/_cpython_cppyy.py", line 21, in <module>
    c = loader.load_cpp_backend()
  File "/Users/laurent/github.com/root-project/install-2/lib/root/cppyy_backend/loader.py", line 79, in load_cpp_backend
    raise RuntimeError("could not load cppyy_backend library")
RuntimeError: could not load cppyy_backend library
>>> quit()

git clone https://github.com/root-project/root
cd root
mkdir build
cmake ../root -DCMAKE_GENERATOR=Ninja -DCMAKE_INSTALL_PREFIX=../install-2 -Dxrootd=OFF -Dgnuinstall=ON
source ../install-2/thisroot.sh
python3 -c 'import ROOT'

   ---------------------------------------------------------------------------
  | Welcome to ROOT 6.33.01                                 https://root.cern |
  | (c) 1995-2024, The ROOT Team; conception: R. Brun, F. Rademakers          |
  | Built for macosxarm64 on Jun 25 2024, 12:00:47                            |
  | From heads/macos-python-import-root-gnuinstall@v6-31-01-2416-gb4c9e549e1  |
  | With Apple clang version 15.0.0 (clang-1500.3.9.4)                        |
  | Try '.help'/'.?', '.demo', '.license', '.credits', '.quit'/'.q'           |
   ---------------------------------------------------------------------------