Error in installing pycairo to Mac OS.

Hello, I’m a science YouTuber in Japan with subscribers 10000+.

I’m such a big fan of 3Blue1Brown’s video that I started to upload mathematical videos. These days, 3b1b’s video makes me want to make mathematical animations like him.

Today, I tried to install manim to my Mac OS Mojave (ver 10.14.4), following Brian Howell’s website (http://bhowell4.com/manic-install-tutorial-for-mac/). But I have a trouble in installing pycairo.

… - … -MacBook-Pro:manim kasagonaoki$ pip install pycairo Collecting pycairo Using cached https://files.pythonhosted.org/packages/48/20/5e83af98eb897935bf7dc39455e892ba866feebb9b7c3b392982866f9958/pycairo-1.18.1.tar.gz Installing collected packages: pycairo Running setup.py install for pycairo … error

ERROR: Complete output from command /Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 -u -c ‘import setuptools, tokenize;file=’“'”‘/private/var/folders/94/qz1q_1015gq84sdfwns2f8hm0000gn/T/pip-install-s_02k2sk/pycairo/setup.py’“'”‘;f=getattr(tokenize, ‘"’“‘open’”’“‘, open)(file);code=f.read().replace(’”‘"’\r\n’“'”‘, ‘"’"’\n’“'”‘);f.close();exec(compile(code, file, ‘"’“‘exec’”’“‘))’ install --record /private/var/folders/94/qz1q_1015gq84sdfwns2f8hm0000gn/T/pip-record-jskbs96p/install-record.txt --single-version-externally-managed --compile: ERROR: running install running build running build_py creating build creating build/lib.macosx-10.9-x86_64-3.7 creating build/lib.macosx-10.9-x86_64-3.7/cairo copying cairo/init.py -> build/lib.macosx-10.9-x86_64-3.7/cairo copying cairo/init.pyi -> build/lib.macosx-10.9-x86_64-3.7/cairo copying cairo/py.typed -> build/lib.macosx-10.9-x86_64-3.7/cairo running build_ext Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc’ to the PKG_CONFIG_PATH environment variable Package ‘libffi’, required by ‘gobject-2.0’, not found Command ‘[‘pkg-config’, ‘–print-errors’, ‘–exists’, ‘cairo >= 1.13.1’]’ returned non-zero exit status 1. ---------------------------------------- ERROR: Command “/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 -u -c ‘import setuptools, tokenize;file=’”'”‘/private/var/folders/94/qz1q_1015gq84sdfwns2f8hm0000gn/T/pip-install-s_02k2sk/pycairo/setup.py’“'”‘;f=getattr(tokenize, ‘"’“‘open’”’“‘, open)(file);code=f.read().replace(’”‘"’\r\n’“'”‘, ‘"’"’\n’“'”‘);f.close();exec(compile(code, file, ‘"’“‘exec’”’“‘))’ install --record /private/var/folders/94/qz1q_1015gq84sdfwns2f8hm0000gn/T/pip-record-jskbs96p/install-record.txt --single-version-externally-managed --compile” failed with error code 1 in /private/var/folders/94/qz1q_1015gq84sdfwns2f8hm0000gn/T/pip-install-s_02k2sk/pycairo/

How do I attack this problem ?

[mrichman]

This solved my problem:

export PKG_CONFIG_PATH="/usr/local/opt/libffi/lib/pkgconfig"
export LDFLAGS="-L/usr/local/opt/libffi/lib" 

[mrichman]

Same error here.