2022-04-26T12:44:22,169 Created temporary directory: /tmp/pip-ephem-wheel-cache-68eovbcl
2022-04-26T12:44:22,174 Created temporary directory: /tmp/pip-req-tracker-1f05tull
2022-04-26T12:44:22,175 Initialized build tracking at /tmp/pip-req-tracker-1f05tull
2022-04-26T12:44:22,175 Created build tracker: /tmp/pip-req-tracker-1f05tull
2022-04-26T12:44:22,175 Entered build tracker: /tmp/pip-req-tracker-1f05tull
2022-04-26T12:44:22,176 Created temporary directory: /tmp/pip-wheel-sfc03d19
2022-04-26T12:44:22,245 Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
2022-04-26T12:44:22,254 2 location(s) to search for versions of pip-pin:
2022-04-26T12:44:22,254 * https://pypi.org/simple/pip-pin/
2022-04-26T12:44:22,254 * https://www.piwheels.org/simple/pip-pin/
2022-04-26T12:44:22,255 Fetching project page and analyzing links: https://pypi.org/simple/pip-pin/
2022-04-26T12:44:22,256 Getting page https://pypi.org/simple/pip-pin/
2022-04-26T12:44:22,259 Found index url https://pypi.org/simple
2022-04-26T12:44:22,382   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/f3/be/c912cfed75abfb825a06b804ab5aef3d6273f6d0de2cc56cf63becd0b7b7/pip_pin-0.0.1-py3-none-any.whl#sha256=bd3956eb5011825c4bb97040d96d7f9c84a4b9e25bfe9da66e1da4889c6837ea (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,383   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/bd/2d/859b924eba29ed47a33ddaad636ce231f117031e4c57e979aa0c1d8a7ee5/pip_pin-0.0.2-py3-none-any.whl#sha256=80e9c1b702fcd6d89c2fc5416c2826a1cc89bcba2efb10313955ecd38e24a629 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,384   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/72/99/b341a6eca9f91da783b905fbf9a3ca7aa596e0ba6ba225f45bab99b4de2d/pip_pin-0.0.3-py3-none-any.whl#sha256=17897d53be5e0476f7872dc1ac2a2474d3f38e0938fbf023bccfe82c87fd9d82 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,384   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/21/aa/eef92c4625dd8be64c183f38078278e1d3393989969e0440a81ddd969dad/pip_pin-0.0.4-py3-none-any.whl#sha256=a59ab6b42b74e980f04334ff883355bfab8c17f838bd1e30faddd68e45e84563 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,385   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/15/28/cb9226625ccca466f9d97a8e656387542414be354967a0801f03bc00e1b5/pip_pin-0.0.5-py3-none-any.whl#sha256=2b02fe43a785e84d9353beaae357e1057455d81fe816ca8fc71f6c8b48fd6518 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,385   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/8c/fb/5c27fbda2509df6de6149b76e4c51d7b152144d0135bfc57d18f89e7faf9/pip_pin-0.0.6-py3-none-any.whl#sha256=a2204c37733f67cff611ea036395242945c696c5c3458d32fdaee2f599d76661 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,387   Found link https://files.pythonhosted.org/packages/10/aa/326eec29a43c7d2dc30d465aedc37af00ac4ab1ca7cd8311350e96f8f830/pip-pin-0.0.6.post1.tar.gz#sha256=67ad5e89ee59082f422bfe86612e23bf52b05f2752bba4021847f90c66fe4fb9 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6), version: 0.0.6.post1
2022-04-26T12:44:22,387   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/ee/a0/cd7662c522b47e082d2efdf5b1cf611d85620bfce9a25aae8ed5d6414310/pip_pin-0.0.6.post1-py3-none-any.whl#sha256=0af48c3e8f7074cb7131403d19293da979207b885103fadf26a197c559b06c13 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,389   Found link https://files.pythonhosted.org/packages/02/f2/ec30b6f6808a5c8d5b906fcdcb71fdd444d1e24df23dae81f2f39cb4f644/pip-pin-0.0.6.post2.tar.gz#sha256=17e4b7fc67ed526f104d5c43424fdc9a04d22d3c0f469d9e4dc9a268625d16aa (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6), version: 0.0.6.post2
2022-04-26T12:44:22,390   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/aa/61/6c26a08f2a800cc643cbf58edf64a6599192238e577a4c18710e3ae0b949/pip_pin-0.0.6.post2-py3-none-any.whl#sha256=4ee14a5ce67bff4f0e1a08cc295612ee659c29d4db7f54b3d0a9cd132696804b (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,391   Found link https://files.pythonhosted.org/packages/9d/97/5df4bed0b615a6a1bfcb2d38c9469fd513a19075d34d6038dfad26244a44/pip-pin-0.0.6.post3.tar.gz#sha256=3e80058db862cc4cdf1c347e7df0b8b2a684c39ffbae8a534b9d3f9fe13e61b5 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6), version: 0.0.6.post3
2022-04-26T12:44:22,392   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/9f/4e/519ca3082c20238d9bbc4fff95d2a28228bce829b44ae253a5386532db43/pip_pin-0.0.6.post3-py3-none-any.whl#sha256=5cb4d2a33679c84bf50beca5ca76299b1f663ebd33eaf3c273fce4046825fc64 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,393   Found link https://files.pythonhosted.org/packages/7b/05/0f0fd38bc4627426b10465ea6fea805d352ded787a958ea75c362993fae6/pip-pin-0.0.7.tar.gz#sha256=fa5f66f44250d1299075087087e0ea23819594d1e8f91725bdd776086e0e230e (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6), version: 0.0.7
2022-04-26T12:44:22,394   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/72/6d/d1d87641662b8b458caa17cf9455d31ddb670e809de09c082db7a4b848f7/pip_pin-0.0.7-py3-none-any.whl#sha256=476e7859882258453783a648de5939ea72549e361f28d3967b83ba5fb4e5e453 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,395   Found link https://files.pythonhosted.org/packages/02/06/c7d533558d469182120fbf4c163f4c3748bd7b3ec9af684d00f1e7d1b507/pip-pin-0.0.8.tar.gz#sha256=181c5b3af33e4c0088fae255d00327391214170ee3d3a322e2f5e3341c215fc4 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6), version: 0.0.8
2022-04-26T12:44:22,396   Skipping link: No binaries permitted for pip-pin: https://files.pythonhosted.org/packages/51/54/b7c5ae49789a619cfe4f781be9921761cbbc722c13286bbd1a17e2e4b213/pip_pin-0.0.8-py3-none-any.whl#sha256=4602966dab9413308d5dea3d6dd8cd070bf3fb6804107420493a776a5b22f645 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,396 Fetching project page and analyzing links: https://www.piwheels.org/simple/pip-pin/
2022-04-26T12:44:22,397 Getting page https://www.piwheels.org/simple/pip-pin/
2022-04-26T12:44:22,399 Found index url https://www.piwheels.org/simple
2022-04-26T12:44:22,645   Skipping link: No binaries permitted for pip-pin: https://www.piwheels.org/simple/pip-pin/pip_pin-0.0.6.post3-py3-none-any.whl#sha256=5cb4d2a33679c84bf50beca5ca76299b1f663ebd33eaf3c273fce4046825fc64 (from https://www.piwheels.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,646   Skipping link: No binaries permitted for pip-pin: https://www.piwheels.org/simple/pip-pin/pip_pin-0.0.6.post2-py3-none-any.whl#sha256=4ee14a5ce67bff4f0e1a08cc295612ee659c29d4db7f54b3d0a9cd132696804b (from https://www.piwheels.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,646   Skipping link: No binaries permitted for pip-pin: https://www.piwheels.org/simple/pip-pin/pip_pin-0.0.6.post1-py3-none-any.whl#sha256=0af48c3e8f7074cb7131403d19293da979207b885103fadf26a197c559b06c13 (from https://www.piwheels.org/simple/pip-pin/) (requires-python:>= 3.6)
2022-04-26T12:44:22,647 Skipping link: not a file: https://www.piwheels.org/simple/pip-pin/
2022-04-26T12:44:22,647 Skipping link: not a file: https://pypi.org/simple/pip-pin/
2022-04-26T12:44:22,692 Given no hashes to check 1 links for project 'pip-pin': discarding no candidates
2022-04-26T12:44:22,732 Collecting pip-pin==0.0.8
2022-04-26T12:44:22,736   Created temporary directory: /tmp/pip-unpack-ttg7a3wq
2022-04-26T12:44:22,827   Downloading pip-pin-0.0.8.tar.gz (4.9 kB)
2022-04-26T12:44:22,904   Added pip-pin==0.0.8 from https://files.pythonhosted.org/packages/02/06/c7d533558d469182120fbf4c163f4c3748bd7b3ec9af684d00f1e7d1b507/pip-pin-0.0.8.tar.gz#sha256=181c5b3af33e4c0088fae255d00327391214170ee3d3a322e2f5e3341c215fc4 to build tracker '/tmp/pip-req-tracker-1f05tull'
2022-04-26T12:44:22,915   Created temporary directory: /tmp/pip-build-env-8t20n6js
2022-04-26T12:44:22,935   Created temporary directory: /tmp/pip-standalone-pip-yyn2nhca
2022-04-26T12:44:25,249   Installing build dependencies: started
2022-04-26T12:44:25,251   Running command pip subprocess to install build dependencies
2022-04-26T12:44:36,993   Using pip 22.0.4 from /tmp/pip-standalone-pip-yyn2nhca/__env_pip__.zip/pip (python 3.9)
2022-04-26T12:44:38,488   Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
2022-04-26T12:44:42,383   Collecting setuptools>=40.8.0
2022-04-26T12:44:42,629     Using cached https://www.piwheels.org/simple/setuptools/setuptools-62.1.0-py3-none-any.whl (1.1 MB)
2022-04-26T12:44:43,280   Collecting wheel
2022-04-26T12:44:43,313     Using cached https://www.piwheels.org/simple/wheel/wheel-0.37.1-py2.py3-none-any.whl (35 kB)
2022-04-26T12:44:47,281   Installing collected packages: wheel, setuptools
2022-04-26T12:44:47,574     Creating /tmp/pip-build-env-8t20n6js/overlay/bin
2022-04-26T12:44:47,578     changing mode of /tmp/pip-build-env-8t20n6js/overlay/bin/wheel to 755
2022-04-26T12:44:52,374   Successfully installed setuptools-62.1.0 wheel-0.37.1
2022-04-26T12:44:53,050   Installing build dependencies: finished with status 'done'
2022-04-26T12:44:53,075   Getting requirements to build wheel: started
2022-04-26T12:44:53,077   Running command Getting requirements to build wheel
2022-04-26T12:44:54,545   Getting requirements to build wheel: finished with status 'done'
2022-04-26T12:44:54,586   Created temporary directory: /tmp/pip-standalone-pip-6qj0u20t
2022-04-26T12:44:56,807   Installing backend dependencies: started
2022-04-26T12:44:56,809   Running command pip subprocess to install backend dependencies
2022-04-26T12:45:08,509   Using pip 22.0.4 from /tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip (python 3.9)
2022-04-26T12:45:10,012   Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
2022-04-26T12:45:10,752   Collecting pytest-runner
2022-04-26T12:45:10,815     Using cached https://www.piwheels.org/simple/pytest-runner/pytest_runner-6.0.0-py3-none-any.whl (7.2 kB)
2022-04-26T12:45:10,977   Collecting pip-pin
2022-04-26T12:45:11,082     Downloading pip-pin-0.0.8.tar.gz (4.9 kB)
2022-04-26T12:45:11,196   ERROR: Exception:
2022-04-26T12:45:11,197   Traceback (most recent call last):
2022-04-26T12:45:11,197     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/cli/base_command.py", line 167, in exc_logging_wrapper
2022-04-26T12:45:11,198       status = run_func(*args)
2022-04-26T12:45:11,198     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/cli/req_command.py", line 205, in wrapper
2022-04-26T12:45:11,198       return func(self, options, args)
2022-04-26T12:45:11,199     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/commands/install.py", line 339, in run
2022-04-26T12:45:11,199       requirement_set = resolver.resolve(
2022-04-26T12:45:11,199     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/resolver.py", line 94, in resolve
2022-04-26T12:45:11,200       result = self._result = resolver.resolve(
2022-04-26T12:45:11,200     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_vendor/resolvelib/resolvers.py", line 481, in resolve
2022-04-26T12:45:11,200       state = resolution.resolve(requirements, max_rounds=max_rounds)
2022-04-26T12:45:11,201     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_vendor/resolvelib/resolvers.py", line 348, in resolve
2022-04-26T12:45:11,201       self._add_to_criteria(self.state.criteria, r, parent=None)
2022-04-26T12:45:11,201     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_vendor/resolvelib/resolvers.py", line 172, in _add_to_criteria
2022-04-26T12:45:11,202       if not criterion.candidates:
2022-04-26T12:45:11,202     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_vendor/resolvelib/structs.py", line 151, in __bool__
2022-04-26T12:45:11,202       return bool(self._sequence)
2022-04-26T12:45:11,202     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/found_candidates.py", line 155, in __bool__
2022-04-26T12:45:11,203       return any(self)
2022-04-26T12:45:11,203     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/found_candidates.py", line 143, in <genexpr>
2022-04-26T12:45:11,203       return (c for c in iterator if id(c) not in self._incompatible_ids)
2022-04-26T12:45:11,204     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/found_candidates.py", line 47, in _iter_built
2022-04-26T12:45:11,204       candidate = func()
2022-04-26T12:45:11,204     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/factory.py", line 215, in _make_candidate_from_link
2022-04-26T12:45:11,204       self._link_candidate_cache[link] = LinkCandidate(
2022-04-26T12:45:11,205     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/candidates.py", line 288, in __init__
2022-04-26T12:45:11,205       super().__init__(
2022-04-26T12:45:11,205     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/candidates.py", line 158, in __init__
2022-04-26T12:45:11,206       self.dist = self._prepare()
2022-04-26T12:45:11,206     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/candidates.py", line 227, in _prepare
2022-04-26T12:45:11,206       dist = self._prepare_distribution()
2022-04-26T12:45:11,207     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/resolution/resolvelib/candidates.py", line 299, in _prepare_distribution
2022-04-26T12:45:11,207       return preparer.prepare_linked_requirement(self._ireq, parallel_builds=True)
2022-04-26T12:45:11,208     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/operations/prepare.py", line 487, in prepare_linked_requirement
2022-04-26T12:45:11,208       return self._prepare_linked_requirement(req, parallel_builds)
2022-04-26T12:45:11,208     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/operations/prepare.py", line 556, in _prepare_linked_requirement
2022-04-26T12:45:11,209       dist = _get_prepared_distribution(
2022-04-26T12:45:11,209     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/operations/prepare.py", line 57, in _get_prepared_distribution
2022-04-26T12:45:11,209       with req_tracker.track(req):
2022-04-26T12:45:11,210     File "/usr/lib/python3.9/contextlib.py", line 117, in __enter__
2022-04-26T12:45:11,210       return next(self.gen)
2022-04-26T12:45:11,210     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/req/req_tracker.py", line 122, in track
2022-04-26T12:45:11,210       self.add(req)
2022-04-26T12:45:11,211     File "/tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip/_internal/req/req_tracker.py", line 92, in add
2022-04-26T12:45:11,211       raise LookupError(message)
2022-04-26T12:45:11,211   LookupError: https://files.pythonhosted.org/packages/02/06/c7d533558d469182120fbf4c163f4c3748bd7b3ec9af684d00f1e7d1b507/pip-pin-0.0.8.tar.gz#sha256=181c5b3af33e4c0088fae255d00327391214170ee3d3a322e2f5e3341c215fc4 (from https://pypi.org/simple/pip-pin/) (requires-python:>= 3.6) is already being built: pip-pin==0.0.8 from https://files.pythonhosted.org/packages/02/06/c7d533558d469182120fbf4c163f4c3748bd7b3ec9af684d00f1e7d1b507/pip-pin-0.0.8.tar.gz#sha256=181c5b3af33e4c0088fae255d00327391214170ee3d3a322e2f5e3341c215fc4
2022-04-26T12:45:11,794   ERROR: [present-diagnostic] pip subprocess to install backend dependencies exited with 2
2022-04-26T12:45:11,832   [bold magenta]full command[/]: [blue]/usr/bin/python3 /tmp/pip-standalone-pip-6qj0u20t/__env_pip__.zip/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-8t20n6js/normal --no-warn-script-location -v --no-binary pip-pin --only-binary :none: -i https://pypi.org/simple --extra-index-url https://www.piwheels.org/simple --prefer-binary -- pytest-runner pip-pin[/]
2022-04-26T12:45:11,833   [bold magenta]cwd[/]: \[inherit]
2022-04-26T12:45:11,833   Installing backend dependencies: finished with status 'error'
2022-04-26T12:45:11,851 ERROR: [present-diagnostic] pip subprocess to install backend dependencies exited with 2
2022-04-26T12:45:11,864 Exception information:
2022-04-26T12:45:11,864 Traceback (most recent call last):
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/cli/base_command.py", line 167, in exc_logging_wrapper
2022-04-26T12:45:11,864     status = run_func(*args)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/cli/req_command.py", line 205, in wrapper
2022-04-26T12:45:11,864     return func(self, options, args)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/commands/wheel.py", line 145, in run
2022-04-26T12:45:11,864     requirement_set = resolver.resolve(reqs, check_supported_wheels=True)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/resolver.py", line 94, in resolve
2022-04-26T12:45:11,864     result = self._result = resolver.resolve(
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 481, in resolve
2022-04-26T12:45:11,864     state = resolution.resolve(requirements, max_rounds=max_rounds)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 348, in resolve
2022-04-26T12:45:11,864     self._add_to_criteria(self.state.criteria, r, parent=None)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 172, in _add_to_criteria
2022-04-26T12:45:11,864     if not criterion.candidates:
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_vendor/resolvelib/structs.py", line 151, in __bool__
2022-04-26T12:45:11,864     return bool(self._sequence)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 155, in __bool__
2022-04-26T12:45:11,864     return any(self)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 143, in <genexpr>
2022-04-26T12:45:11,864     return (c for c in iterator if id(c) not in self._incompatible_ids)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 47, in _iter_built
2022-04-26T12:45:11,864     candidate = func()
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/factory.py", line 215, in _make_candidate_from_link
2022-04-26T12:45:11,864     self._link_candidate_cache[link] = LinkCandidate(
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/candidates.py", line 288, in __init__
2022-04-26T12:45:11,864     super().__init__(
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/candidates.py", line 158, in __init__
2022-04-26T12:45:11,864     self.dist = self._prepare()
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/candidates.py", line 227, in _prepare
2022-04-26T12:45:11,864     dist = self._prepare_distribution()
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/resolution/resolvelib/candidates.py", line 299, in _prepare_distribution
2022-04-26T12:45:11,864     return preparer.prepare_linked_requirement(self._ireq, parallel_builds=True)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/operations/prepare.py", line 487, in prepare_linked_requirement
2022-04-26T12:45:11,864     return self._prepare_linked_requirement(req, parallel_builds)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/operations/prepare.py", line 556, in _prepare_linked_requirement
2022-04-26T12:45:11,864     dist = _get_prepared_distribution(
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/operations/prepare.py", line 58, in _get_prepared_distribution
2022-04-26T12:45:11,864     abstract_dist.prepare_distribution_metadata(finder, build_isolation)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/distributions/sdist.py", line 45, in prepare_distribution_metadata
2022-04-26T12:45:11,864     self._install_build_reqs(finder)
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/distributions/sdist.py", line 108, in _install_build_reqs
2022-04-26T12:45:11,864     self.req.build_env.install_requirements(
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/build_env.py", line 202, in install_requirements
2022-04-26T12:45:11,864     self._install_requirements(
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/build_env.py", line 260, in _install_requirements
2022-04-26T12:45:11,864     call_subprocess(
2022-04-26T12:45:11,864   File "/usr/local/lib/python3.9/dist-packages/pip/_internal/utils/subprocess.py", line 224, in call_subprocess
2022-04-26T12:45:11,864     raise error
2022-04-26T12:45:11,864 pip._internal.exceptions.InstallationSubprocessError: pip subprocess to install backend dependencies exited with 2
2022-04-26T12:45:11,882 Removed pip-pin==0.0.8 from https://files.pythonhosted.org/packages/02/06/c7d533558d469182120fbf4c163f4c3748bd7b3ec9af684d00f1e7d1b507/pip-pin-0.0.8.tar.gz#sha256=181c5b3af33e4c0088fae255d00327391214170ee3d3a322e2f5e3341c215fc4 from build tracker '/tmp/pip-req-tracker-1f05tull'
2022-04-26T12:45:11,884 Removed build tracker: '/tmp/pip-req-tracker-1f05tull'