BlenderScriptsDirUnknownError when bpy_post_install on MacoOS

[diemort]

Describe the bug
Same error as found in #41

raceback (most recent call last):
  File "/usr/local/bin/bpy_post_install", line 11, in <module>
    sys.exit(post_install())
  File "/usr/local/lib/python3.7/site-packages/blenderpy/post_install.py", line 47, in post_install
    install_scripts_directory()
  File "/usr/local/lib/python3.7/site-packages/blenderpy/post_install.py", line 43, in install_scripts_directory
    +blender_scripts_search_root_dir)
blenderpy.BlenderScriptsDirUnknownError: Could not find Blender scripts directory in /usr/local/opt

To Reproduce
pip3 install bpy-2.91a0-cp37-cp37m-macosx_10_13_x86_64.whl && bpy_post_install

[email protected] installed via brew

>>> import sys
>>> sys.executable
'/usr/local/opt/[email protected]/bin/python3.7'

blender installed via brew
/usr/local/Caskroom/blender/2.92.0/
with scripts at:
/usr/local/Caskroom/blender/2.92.0/Blender.app/Contents/Resources/2.92/scripts/
and not at
/usr/local/opt/

More error code below after testing a short code.

Expected behavior
Clear success in post installation step.

Desktop (please complete the following information):

• OS: MacOS Catalina 10.15.7
• No Xcode neither command line tools.

Additional context
Before removing command line tools I tried:
python3 -m pip install bpy
but after long minutes it fails after skipping the CXX flag with:
xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
and found no way to properly link the c++ compiler. After deleting '/Library/Developer/CommandLineTools' cmake fails to find c++ compiler, even though it is at /usr/bin.

Short test code
A test with a test code results in the following error, possibly because post_install did not succeed:

Color management: using fallback mode for management
Color management: Error could not find role data role.
BLT_lang_init: 'locale' data path for translations not found, continuing
Color management: scene view "Filmic" not found, setting default "Standard".
blf_load_font_default: 'fonts' data path not found for 'droidsans.ttf', will not be able to display text
blf_load_font_default: 'fonts' data path not found for 'bmonofont-i18n.ttf', will not be able to display text
blf_load_font_default: 'fonts' data path not found for 'bmonofont-i18n.ttf', will not be able to display text
bpy: couldn't find 'scripts/modules', blender probably wont start.
Freestyle: couldn't find 'scripts/freestyle/modules', Freestyle won't work properly.
ModuleNotFoundError: No module named 'bpy_types'
ModuleNotFoundError: No module named 'bpy_types'
ERROR (bpy.rna): /Users/tylergubala/Code/Python/blenderpy/Blender/blender/source/blender/python/intern/bpy_rna.c:7241 pyrna_srna_ExternalType: failed to find 'bpy_types' module
ModuleNotFoundError: No module named 'bpy_types'
ModuleNotFoundError: No module named 'bpy_types'
ERROR (bpy.rna): /Users/tylergubala/Code/Python/blenderpy/Blender/blender/source/blender/python/intern/bpy_rna.c:7241 pyrna_srna_ExternalType: failed to find 'bpy_types' module
ModuleNotFoundError: No module named 'bpy_types'
ERROR (bpy.rna): /Users/tylergubala/Code/Python/blenderpy/Blender/blender/source/blender/python/intern/bpy_rna.c:7241 pyrna_srna_ExternalType: failed to find 'bpy_types' module
ModuleNotFoundError: No module named 'bpy_types'
ERROR (bpy.rna): /Users/tylergubala/Code/Python/blenderpy/Blender/blender/source/blender/python/intern/bpy_rna.c:7241 pyrna_srna_ExternalType: failed to find 'bpy_types' module
ModuleNotFoundError: No module named 'bpy_types'
ERROR (bpy.rna): /Users/tylergubala/Code/Python/blenderpy/Blender/blender/source/blender/python/intern/bpy_rna.c:7241 pyrna_srna_ExternalType: failed to find 'bpy_types' module
ModuleNotFoundError: No module named 'bpy_types'
ERROR (bpy.rna): /Users/tylergubala/Code/Python/blenderpy/Blender/blender/source/blender/python/intern/bpy_rna.c:7241 pyrna_srna_ExternalType: failed to find 'bpy_types' module
ModuleNotFoundError: No module named 'bpy_types'
ERROR (bpy.rna): /Users/tylergubala/Code/Python/blenderpy/Blender/blender/source/blender/python/intern/bpy_rna.c:7241 pyrna_srna_ExternalType: failed to find 'bpy_types' module
F0414 21:58:16.315747 257584576 utilities.cc:346] Check failed: !IsGoogleLoggingInitialized() You called InitGoogleLogging() twice!
*** Check failure stack trace: ***
    @        0x111fad91f  google::LogMessageFatal::~LogMessageFatal()
    @        0x111fa9be9  google::LogMessageFatal::~LogMessageFatal()
    @        0x111fb297c  google::glog_internal_namespace_::InitGoogleLoggingUtilities()
    @        0x1105b440e  libmv_initLogging
    @        0x10f721be2  main_python_enter
    @        0x110071b87  dealloc_obj_dealloc
    @        0x10a460c5c  insertdict
    @        0x10a463d20  PyDict_SetItemString
    @        0x10a4f07a6  PyModule_AddObject
    @        0x10a4ed191  _PyImport_LoadDynamicModuleWithSpec
    @        0x10a4ecaa5  _imp_create_dynamic
    @        0x10a44181d  _PyMethodDef_RawFastCallDict
    @        0x10a440e23  _PyCFunction_FastCallDict
    @        0x10a4d45ba  _PyEval_EvalFrameDefault
    @        0x10a4d750f  _PyEval_EvalCodeWithName
    @        0x10a441132  _PyFunction_FastCallKeywords
    @        0x10a4d6c76  call_function
    @        0x10a4d41e1  _PyEval_EvalFrameDefault
    @        0x10a44153e  function_code_fastcall
    @        0x10a4d6c76  call_function
    @        0x10a4d41c8  _PyEval_EvalFrameDefault
    @        0x10a44153e  function_code_fastcall
    @        0x10a4d6c76  call_function
    @        0x10a4d4288  _PyEval_EvalFrameDefault
    @        0x10a44153e  function_code_fastcall
    @        0x10a4d6c76  call_function
    @        0x10a4d4288  _PyEval_EvalFrameDefault
    @        0x10a44153e  function_code_fastcall
    @        0x10a4d6c76  call_function
    @        0x10a4d4288  _PyEval_EvalFrameDefault
    @        0x10a44153e  function_code_fastcall
    @        0x10a4428f8  object_vacall
Abort trap: 6

UPDATE #1
Just to confirm that the same error occurs even with command line tools installed.

UPDATE #2
Following #86 : adding followlinks=True in init.py did not solve the problem. For some reason python is not following the link to brew blender:
/usr/local/bin/blender -> /usr/local/Caskroom/blender/2.92.0/blender.wrapper.sh
which is outside /opt of python:
/usr/local/opt/[email protected]/bin/python3.7
and may be the reason that init.py does not find the proper path. I only managed to make it work after defining:
blender_scripts_current_dir = "/usr/local/Caskroom/blender/2.92.0/Blender.app/Contents/Resources/2.92/scripts/"
in post_install.py (dirty edit).