Error Installing PyPotrace on Mac OS Big Sur

[AaaaronH]

I followed the instructions to install pypotracer on my mac, but an error occurred at the final step.

Processing /Users/pokedude/Downloads/pypotrace-master
DEPRECATION: A future pip version will change local packages to be built in-place without first copying to a temporary directory. We recommend you use --use-feature=in-tree-build to test your packages with this new behavior before it becomes the default.
pip 21.3 will remove support for this functionality. You can find discussion regarding this at pypa/pip#7555.
Installing build dependencies ... done
Getting requirements to build wheel ... done
Preparing wheel metadata ... done
Requirement already satisfied: numpy in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from potrace==0.3) (1.17.0)
Building wheels for collected packages: potrace
Building wheel for potrace (PEP 517) ... error
ERROR: Command errored out with exit status 1:
command: /Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py build_wheel /var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/tmp1pi556jp
cwd: /private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-req-build-xh364utg
Complete output (36 lines):
Package libagg was not found in the pkg-config search path.
Perhaps you should add the directory containing `libagg.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libagg' found
Traceback (most recent call last):
File "/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-req-build-xh364utg/setup.py", line 28, in
build(setup_kwargs)
File "/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-req-build-xh364utg/build.py", line 19, in build
extra_compile_args = pkg_config("libagg", '--cflags')
File "/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-req-build-xh364utg/build.py", line 11, in pkg_config
return subprocess.check_output(["pkg-config", command, pkg_name]).decode(
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/subprocess.py", line 389, in check_output
**kwargs).stdout
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/subprocess.py", line 481, in run
output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['pkg-config', '--cflags', 'libagg']' returned non-zero exit status 1.
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 349, in
main()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 331, in main
json_out['return_val'] = hook(**hook_input['kwargs'])
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 249, in build_wheel
metadata_directory)
File "/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-build-env-h9f48l8h/overlay/lib/python3.7/site-packages/poetry/core/masonry/api.py", line 68, in build_wheel
return unicode(WheelBuilder.make_in(poetry, Path(wheel_directory)))
File "/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-build-env-h9f48l8h/overlay/lib/python3.7/site-packages/poetry/core/masonry/builders/wheel.py", line 72, in make_in
wb.build()
File "/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-build-env-h9f48l8h/overlay/lib/python3.7/site-packages/poetry/core/masonry/builders/wheel.py", line 103, in build
self._build(zip_file)
File "/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-build-env-h9f48l8h/overlay/lib/python3.7/site-packages/poetry/core/masonry/builders/wheel.py", line 135, in _build
self._run_build_command(setup)
File "/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-build-env-h9f48l8h/overlay/lib/python3.7/site-packages/poetry/core/masonry/builders/wheel.py", line 169, in _run_build_command
str(self._path / "build"),
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/subprocess.py", line 341, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7', '/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-req-build-xh364utg/setup.py', 'build', '-b', '/private/var/folders/t1/yjb9fy9x3z753rkj68mrz97w0000gn/T/pip-req-build-xh364utg/build']' returned non-zero exit status 1.

ERROR: Failed building wheel for potrace
Failed to build potrace
ERROR: Could not build wheels for potrace which use PEP 517 and cannot be installed directly

I have already installed potrace with brew, but now I want to install the library for Python.