error installing pypotrace via pip

[Xardous]

trying to download pypotrace on virtualenv

os:mac 10.15.6 catalina

cmd i used
python3 -m pip install pypotrace

what i am getting:
`Collecting pypotrace
Using cached pypotrace-0.3.tar.gz (11 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... done
Preparing wheel metadata ... done
Requirement already satisfied: numpy in /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages (from pypotrace) (1.20.3)
Building wheels for collected packages: pypotrace
Building wheel for pypotrace (PEP 517) ... error
ERROR: Command errored out with exit status 1:
command: /usr/local/bin/python3 /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py build_wheel /var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/tmpdr5ftg9m
cwd: /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103
Complete output (66 lines):
A setup.py file already exists. Using it.
['-I/usr/local/Cellar/libagg/2.5/include/agg2']
['-L/usr/local/Cellar/libagg/2.5/lib', '-Wl,-rpath,/usr/local/Cellar/libagg/2.5/lib', '-lagg']
Compiling potrace/_potrace.pyx because it changed.
Compiling potrace/bezier.pyx because it changed.
Compiling potrace/agg/curves.pyx because it changed.
[1/3] Cythonizing potrace/_potrace.pyx
[2/3] Cythonizing potrace/agg/curves.pyx
[3/3] Cythonizing potrace/bezier.pyx
running build
running build_py
creating /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build
creating /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8
creating /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace
copying potrace/init.py -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace
creating /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace/agg
copying potrace/agg/init.py -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace/agg
copying potrace/_potrace.c -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace
copying potrace/bezier.pxd -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace
copying potrace/bezier.cpp -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace
copying potrace/_potrace.pxd -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace
copying potrace/_potrace.pyx -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace
copying potrace/bezier.pyx -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace
copying potrace/agg/curves.pyx -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace/agg
copying potrace/agg/basics.pxd -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace/agg
copying potrace/agg/curves.pxd -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace/agg
copying potrace/agg/curves.cpp -> /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/lib.macosx-10.9-x86_64-3.8/potrace/agg
running build_ext
building 'potrace._potrace' extension
creating /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/temp.macosx-10.9-x86_64-3.8
creating /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/temp.macosx-10.9-x86_64-3.8/potrace
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -I/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/numpy/core/include -I/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/numpy/core/include -I/Library/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c potrace/_potrace.c -o /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build/temp.macosx-10.9-x86_64-3.8/potrace/_potrace.o
potrace/_potrace.c:635:10: fatal error: 'potracelib.h' file not found
#include "potracelib.h"
^~~~~~~~~~~~~~
1 error generated.
/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/Cython/Compiler/Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/potrace/_potrace.pxd
tree = Parsing.p_module(s, pxd, full_module_name)
warning: potrace/_potrace.pyx:328:30: Non-trivial type declarators in shared declaration (e.g. mix of pointers and values). Each pointer declaration should be on its own line.
warning: potrace/_potrace.pyx:328:35: Non-trivial type declarators in shared declaration (e.g. mix of pointers and values). Each pointer declaration should be on its own line.
warning: potrace/_potrace.pyx:328:40: Non-trivial type declarators in shared declaration (e.g. mix of pointers and values). Each pointer declaration should be on its own line.
/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/Cython/Compiler/Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/potrace/agg/curves.pxd
tree = Parsing.p_module(s, pxd, full_module_name)
/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/Cython/Compiler/Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/potrace/bezier.pxd
tree = Parsing.p_module(s, pxd, full_module_name)
error: command 'gcc' failed with exit status 1
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 280, in
main()
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 263, in main
json_out['return_val'] = hook(**hook_input['kwargs'])
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 204, in build_wheel
return _build_backend().build_wheel(wheel_directory, config_settings,
File "/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/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/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/poetry/core/masonry/builders/wheel.py", line 72, in make_in
wb.build()
File "/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/poetry/core/masonry/builders/wheel.py", line 103, in build
self._build(zip_file)
File "/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/poetry/core/masonry/builders/wheel.py", line 135, in _build
self._run_build_command(setup)
File "/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-build-env-flktxk3t/overlay/lib/python3.8/site-packages/poetry/core/masonry/builders/wheel.py", line 163, in _run_build_command
subprocess.check_call(
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/subprocess.py", line 364, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/local/bin/python3', '/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/setup.py', 'build', '-b', '/private/var/folders/tf/k90xr_cx3x35_6_spm02qcpr0000gn/T/pip-install-w4eu4b72/pypotrace_ee512bbaddbd461fab7ba85c2d563103/build']' returned non-zero exit status 1.

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

how do i fix it?

thanks

[alexjslessor]

Hello, yes I am getting this also.

[flupke]

Hello, the potrace library needs to be installed on your system.

On MacOS you can install it with brew: brew install potrace

Check brew output for any additional steps required to make the library visible to your compiler.

[Ubuntufanboy]

I found the solution. You cannot do sudo apt install potrace you need to use the command on the README sudo apt-get install build-essential python-dev libagg-dev libpotrace-dev pkg-config then clone the repo, cd into it, install numpy, then do pip3 install .

[hi101000]

I found the solution. You cannot do sudo apt install potrace you need to use the command on the README sudo apt-get install build-essential python-dev libagg-dev libpotrace-dev pkg-config then clone the repo, cd into it, install numpy, then do pip3 install .

I don't think apt works on mac

[dimcoord]

Try installing python-dev-is-python3 instead of python-dev. It worked for me.