this derivation will be built:
  /nix/store/5h8gqfx9ddarnmp9k30a6v352hgvsrlz-withoutbg-1.5.0.drv
building '/nix/store/5h8gqfx9ddarnmp9k30a6v352hgvsrlz-withoutbg-1.5.0.drv' on 'ssh-ng://nix-remote-builder@rofl-16.brkn.lol'
building '/nix/store/5h8gqfx9ddarnmp9k30a6v352hgvsrlz-withoutbg-1.5.0.drv'
withoutbg-1.5.0> structuredAttrs is enabled
withoutbg-1.5.0> Sourcing python-remove-tests-dir-hook
withoutbg-1.5.0> Sourcing python-catch-conflicts-hook.sh
withoutbg-1.5.0> Sourcing python-remove-bin-bytecode-hook.sh
withoutbg-1.5.0> Sourcing pypa-build-hook
withoutbg-1.5.0> Using pypaBuildPhase
withoutbg-1.5.0> Sourcing python-runtime-deps-check-hook
withoutbg-1.5.0> Using pythonRuntimeDepsCheckHook
withoutbg-1.5.0> Sourcing pypa-install-hook
withoutbg-1.5.0> Using pypaInstallPhase
withoutbg-1.5.0> Sourcing python-imports-check-hook.sh
withoutbg-1.5.0> Using pythonImportsCheckPhase
withoutbg-1.5.0> Sourcing python-namespaces-hook
withoutbg-1.5.0> Sourcing python-catch-conflicts-hook.sh
withoutbg-1.5.0> Using checkPhaseThreadLimitHook
withoutbg-1.5.0> Running phase: unpackPhase
withoutbg-1.5.0> unpacking source archive /nix/store/b257phgaqhhiwzhp1z4pajhp5yn1vp9j-source
withoutbg-1.5.0> source root is source
withoutbg-1.5.0> setting SOURCE_DATE_EPOCH to timestamp 315619200 of file "source/uv.lock"
withoutbg-1.5.0> Running phase: patchPhase
withoutbg-1.5.0> Running phase: updateAutotoolsGnuConfigScriptsPhase
withoutbg-1.5.0> Running phase: configurePhase
withoutbg-1.5.0> no configure script, doing nothing
withoutbg-1.5.0> Running phase: buildPhase
withoutbg-1.5.0> Executing pypaBuildPhase
withoutbg-1.5.0> Creating a wheel...
withoutbg-1.5.0> pypa build flags: --no-isolation --outdir dist/ --wheel
withoutbg-1.5.0> * Getting build dependencies for wheel...
withoutbg-1.5.0> * Building wheel...
withoutbg-1.5.0> Successfully built withoutbg-1.5.0-py3-none-any.whl
withoutbg-1.5.0> Finished creating a wheel...
withoutbg-1.5.0> Finished executing pypaBuildPhase
withoutbg-1.5.0> Running phase: pythonRuntimeDepsCheckHook
withoutbg-1.5.0> Executing pythonRuntimeDepsCheck
withoutbg-1.5.0> Checking runtime dependencies for withoutbg-1.5.0-py3-none-any.whl
withoutbg-1.5.0>   - opencv-python-headless not installed
error: build of '/nix/store/5h8gqfx9ddarnmp9k30a6v352hgvsrlz-withoutbg-1.5.0.drv' on 'ssh-ng://nix-remote-builder@rofl-16.brkn.lol' failed: Cannot build '/nix/store/5h8gqfx9ddarnmp9k30a6v352hgvsrlz-withoutbg-1.5.0.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/4wwd5pc5v0aac0ll7h94wimh9g0fgm2h-withoutbg-1.5.0
         /nix/store/8wj4fl3zzbdsjacdwd9d1kdvw8dzck5f-withoutbg-1.5.0-dist
       Last 25 log lines:
       > Using pythonImportsCheckPhase
       > Sourcing python-namespaces-hook
       > Sourcing python-catch-conflicts-hook.sh
       > Using checkPhaseThreadLimitHook
       > Running phase: unpackPhase
       > unpacking source archive /nix/store/b257phgaqhhiwzhp1z4pajhp5yn1vp9j-source
       > source root is source
       > setting SOURCE_DATE_EPOCH to timestamp 315619200 of file "source/uv.lock"
       > Running phase: patchPhase
       > Running phase: updateAutotoolsGnuConfigScriptsPhase
       > Running phase: configurePhase
       > no configure script, doing nothing
       > Running phase: buildPhase
       > Executing pypaBuildPhase
       > Creating a wheel...
       > pypa build flags: --no-isolation --outdir dist/ --wheel
       > * Getting build dependencies for wheel...
       > * Building wheel...
       > Successfully built withoutbg-1.5.0-py3-none-any.whl
       > Finished creating a wheel...
       > Finished executing pypaBuildPhase
       > Running phase: pythonRuntimeDepsCheckHook
       > Executing pythonRuntimeDepsCheck
       > Checking runtime dependencies for withoutbg-1.5.0-py3-none-any.whl
       >   - opencv-python-headless not installed
       For full logs, run:
         nix log /nix/store/5h8gqfx9ddarnmp9k30a6v352hgvsrlz-withoutbg-1.5.0.drv
error: Cannot build '/nix/store/5h8gqfx9ddarnmp9k30a6v352hgvsrlz-withoutbg-1.5.0.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/4wwd5pc5v0aac0ll7h94wimh9g0fgm2h-withoutbg-1.5.0
         /nix/store/8wj4fl3zzbdsjacdwd9d1kdvw8dzck5f-withoutbg-1.5.0-dist