Perhaps due to recent addition/changes for python sanity-check? Here is the relevant portion of the log from running ./pre-inst-env guix build python-pyyaml on core-updates:
warning: build_py: byte-compiling is disabled, skipping. running build_ext building 'yaml._yaml' extension creating build/temp.linux-x86_64-3.9 creating build/temp.linux-x86_64-3.9/yaml gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fno-semantic-interposition -fPIC -I/gnu/store/4nrih35yjsz2kwhr4pwxnkdzjmkgxxfq-python-3.9.5/include/python3.9 -c yaml/_yaml.c -o build/temp.linux-x86_64-3.9/yaml/_yaml.o gcc: error: yaml/_yaml.c: No such file or directory gcc: fatal error: no input files compilation terminated. Error compiling module, falling back to pure Python phase `build' succeeded after 0.3 seconds starting phase `install' running "python setup.py" with command "install" and parameters ("--prefix=/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1" "--no-compile" "--single-version-externally-managed" "--root=/") running install running build running build_py warning: build_py: byte-compiling is disabled, skipping. running build_ext building 'yaml._yaml' extension gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fno-semantic-interposition -fPIC -I/gnu/store/4nrih35yjsz2kwhr4pwxnkdzjmkgxxfq-python-3.9.5/include/python3.9 -c yaml/_yaml.c -o build/temp.linux-x86_64-3.9/yaml/_yaml.o gcc: error: yaml/_yaml.c: No such file or directory gcc: fatal error: no input files compilation terminated. Error compiling module, falling back to pure Python running install_lib creating /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1 creating /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib creating /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9 creating /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages creating /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/_yaml copying build/lib.linux-x86_64-3.9/_yaml/__init__.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/_yaml creating /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/__init__.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/composer.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/constructor.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/cyaml.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/dumper.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/emitter.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/error.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/events.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/loader.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/nodes.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/parser.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/reader.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/representer.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/resolver.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/scanner.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/serializer.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml copying build/lib.linux-x86_64-3.9/yaml/tokens.py -> /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml warning: install_lib: byte-compiling is disabled, skipping. running install_egg_info running egg_info writing lib3/PyYAML.egg-info/PKG-INFO writing dependency_links to lib3/PyYAML.egg-info/dependency_links.txt writing top-level names to lib3/PyYAML.egg-info/top_level.txt warning: the 'license_file' option is deprecated, use 'license_files' instead adding license file 'LICENSE' (matched pattern 'LICENSE') reading manifest file 'lib3/PyYAML.egg-info/SOURCES.txt' reading manifest template 'MANIFEST.in' writing manifest file 'lib3/PyYAML.egg-info/SOURCES.txt' Copying lib3/PyYAML.egg-info to /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/PyYAML-5.4.1-py3.9.egg-info running install_scripts Listing '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1'... Listing '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib'... Listing '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9'... Listing '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages'... Listing '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/PyYAML-5.4.1-py3.9.egg-info'... Listing '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/_yaml'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/_yaml/__init__.py'... Listing '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/__init__.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/composer.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/constructor.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/cyaml.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/dumper.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/emitter.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/error.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/events.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/loader.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/nodes.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/parser.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/reader.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/representer.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/resolver.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/scanner.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/serializer.py'... Compiling '/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/yaml/tokens.py'... phase `install' succeeded after 0.5 seconds starting phase `add-install-to-pythonpath' phase `add-install-to-pythonpath' succeeded after 0.0 seconds starting phase `add-install-to-path' phase `add-install-to-path' succeeded after 0.0 seconds starting phase `wrap' find-files: /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/bin: No such file or directory find-files: /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/sbin: No such file or directory phase `wrap' succeeded after 0.0 seconds starting phase `check' running "python setup.py" with command "test" and parameters () running test running build_py warning: build_py: byte-compiling is disabled, skipping. running build_ext building 'yaml._yaml' extension gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fno-semantic-interposition -fPIC -I/gnu/store/4nrih35yjsz2kwhr4pwxnkdzjmkgxxfq-python-3.9.5/include/python3.9 -c yaml/_yaml.c -o build/temp.linux-x86_64-3.9/yaml/_yaml.o gcc: error: yaml/_yaml.c: No such file or directory gcc: fatal error: no input files compilation terminated. Error compiling module, falling back to pure Python ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ =========================================================================== TESTS: 1288 phase `check' succeeded after 4.3 seconds starting phase `sanity-check' validating 'PyYAML' /gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages ...checking requirements: OK ...trying to load module _yaml: ERROR: Traceback (most recent call last): File "/gnu/store/slim8x2ppjhici2iiabmyvg9lxyikiwy-sanity-check.py", line 69, in <module> importlib.import_module(name) File "/gnu/store/4nrih35yjsz2kwhr4pwxnkdzjmkgxxfq-python-3.9.5/lib/python3.9/importlib/__init__.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1030, in _gcd_import File "<frozen importlib._bootstrap>", line 1007, in _find_and_load File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 680, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 855, in exec_module File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed File "/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages/_yaml/__init__.py", line 14, in <module> raise exc("No module named '_yaml'") ModuleNotFoundError: No module named '_yaml' ...trying to load module yaml: OK error: in phase 'sanity-check': uncaught exception: %exception #<&invoke-error program: "python" arguments: ("/gnu/store/slim8x2ppjhici2iiabmyvg9lxyikiwy-sanity-check.py" "/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages") exit-status: 1 term-signal: #f stop-signal: #f> phase `sanity-check' failed after 0.2 seconds command "python" "/gnu/store/slim8x2ppjhici2iiabmyvg9lxyikiwy-sanity-check.py" "/gnu/store/i9aqd2hcrfc68ykd24nnjw1nzrdyazrs-python-pyyaml-5.4.1/lib/python3.9/site-packages" failed with status 1 builder for `/gnu/store/m9vvvh5qpkrcd0hra3dpri1yqns9m36w-python-pyyaml-5.4.1.drv' failed with exit code 1 build of /gnu/store/m9vvvh5qpkrcd0hra3dpri1yqns9m36w-python-pyyaml-5.4.1.drv failed View build log at '/var/log/guix/drvs/m9/vvvh5qpkrcd0hra3dpri1yqns9m36w-python-pyyaml-5.4.1.drv.bz2'. guix build: error: build of `/gnu/store/m9vvvh5qpkrcd0hra3dpri1yqns9m36w-python-pyyaml-5.4.1.drv' failed