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Note: you may need to change version numbers, i.e., 3.7 -> 3.8, or 2.81 -> 2.90. Although 3.8 is giving some segfaults.

Pre-requisite

  1. Xcode (>=8.5)
  2. Python 3.7 (In /Library/Frameworks/Python.framework/Versions/3.7) I personally downloaded a new one on my machine globally here Note that you may need to install specific command line tools for xcode if SVN blows up.
sudo rm -rf /Library/Developer/CommandLineTools xcode-select --install

Always be careful with sudo and rm -rf.

If that fails with an SVN error again, try brew install svn.

Compilation

(Reference here & here)

Download Sources and Libraries

Now you are ready to get the latest Blender source code from Blender.org's Git repository. Copy and paste the following instructions into a terminal window. These will create a blender-git folder off your home directory and download the latest source code, as well as addons and external libraries.

mkdir ~/blender-git
cd ~/blender-git
git clone https://git.blender.org/blender.git
cd blender
make update

Building python module

Make a directory: mkdir ~/blender-git/build_bpy_darwin

cd ~/blender-git/build_bpy_darwin
cmake ../blender -DWITH_PLAYER=OFF -DWITH_PYTHON_INSTALL=OFF -DWITH_PYTHON_MODULE=ON -DWITH_OPENMP=OFF -DWITH_AUDASPACE=OFF

According to various posts, we need to disable WITH_OPENMP and WITH_AUDASPACE in addition to the ones that blender documentation points out. Then run

make  install

Install python module

Copy needed files to your python framework

cp ./bin/bpy.so /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/
mkdir -p /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/Resources
cp -R ./bin/2.81 /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/Resources/

Testing

I used

alias python37="usr/local/bin/python3.7"

Then we can test installation by

python37 -c "import bpy; bpy.context.scene.render.engine = 'CYCLES'; bpy.ops.render.render(write_still=True)

Adding svglib to Blender's python

cd /path/to/blender/python/bin
./pythonX.XX -m ensurepip
./pythonX.XX -m pip install svglib

where XX.X should be replaced by the version number. In my setup it looks like:

cd /Applications/Blender.app/Contents/Resources/2.82/python/bin
./python3.7m -m ensurepip
./python3.7m -m pip install svglib
./python3.7m -m pip install svgpathtools

Once that's run, you can run this from anywhere for any new package:

/Applications/Blender.app/Contents/Resources/2.82/python/bin/python3.7m -m pip install <packagename>

Trouble shooting

I ran into segmentation fault with

Python 3.7.6 (default, Jan  8 2020, 13:42:34)
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import bpy
fish: Job 2, 'python3  $argv' terminated by signal SIGSEGV (Address boundary error)

if I copy this into Anaconda virtual environment (the same issue from this post) Working from the system python resolves the issue.

Segfault persists with Python 3.8.