# ImportError and CompileError from default, fresh conda installation

**URL:** <https://discourse.pymc.io/t/importerror-and-compileerror-from-default-fresh-conda-installation/15932>\
**Category:** v5\
**Tags:** bug, installation\
**Created:** [October 7, 2024, 1:25pm UTC](https://discourse.pymc.io/t/importerror-and-compileerror-from-default-fresh-conda-installation/15932 "2024-10-07T13:25:06Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![simozacca](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/simozacca/32/8601_2.png) [@simozacca](https://discourse.pymc.io/u/simozacca)\
**Post date:** [October 7, 2024, 1:25pm UTC](https://discourse.pymc.io/t/importerror-and-compileerror-from-default-fresh-conda-installation/15932/1 "2024-10-07T13:25:06Z")

</div>

Hi everyone,

Thank you so much for this oustanding tool. We are new but very passionate users of PyMC and we have already been using it since a few months at UCL. However, since the last few weeks we are encountering some errors on MacOS from the default conda installation even in a fresh new env.

Specifically, after creating a new default env with

```auto
mamba create -c conda-forge -n mypymc "pymc>=5"

```

which successfully create an env with the following packages all from `conda-forge`:

> **Summary**
>
> ```auto
> Package Version Build Channel Size
> ───────────────────────────────────────────────────────────────────────────────────────────────────────────
> Install:
> ───────────────────────────────────────────────────────────────────────────────────────────────────────────
> 
> + arviz 0.20.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + atk-1.0 2.38.0 h4bec284_2 conda-forge/osx-64 Cached
> + blas 2.122 openblas conda-forge/osx-64 Cached
> + blas-devel 3.9.0 22_osx64_openblas conda-forge/osx-64 Cached
> + brotli 1.1.0 h00291cd_2 conda-forge/osx-64 Cached
> + brotli-bin 1.1.0 h00291cd_2 conda-forge/osx-64 Cached
> + bzip2 1.0.8 hfdf4475_7 conda-forge/osx-64 Cached
> + c-ares 1.33.1 h44e7173_0 conda-forge/osx-64 Cached
> + ca-certificates 2024.8.30 h8857fd0_0 conda-forge/osx-64 Cached
> + cached-property 1.5.2 hd8ed1ab_1 conda-forge/noarch Cached
> + cached_property 1.5.2 pyha770c72_1 conda-forge/noarch Cached
> + cachetools 5.5.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + cairo 1.18.0 h37bd5c4_3 conda-forge/osx-64 Cached
> + cctools_osx-64 1010.6 h98e843e_1 conda-forge/osx-64 Cached
> + certifi 2024.8.30 pyhd8ed1ab_0 conda-forge/noarch Cached
> + clang 17.0.6 default_he371ed4_7 conda-forge/osx-64 Cached
> + clang-17 17.0.6 default_hb173f14_7 conda-forge/osx-64 Cached
> + clang_impl_osx-64 17.0.6 h1af8efd_19 conda-forge/osx-64 Cached
> + clang_osx-64 17.0.6 hb91bd55_19 conda-forge/osx-64 Cached
> + clangxx 17.0.6 default_he371ed4_7 conda-forge/osx-64 Cached
> + clangxx_impl_osx-64 17.0.6 hc3430b7_19 conda-forge/osx-64 Cached
> + clangxx_osx-64 17.0.6 hb91bd55_19 conda-forge/osx-64 Cached
> + cloudpickle 3.0.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + compiler-rt 17.0.6 h1020d70_2 conda-forge/osx-64 Cached
> + compiler-rt_osx-64 17.0.6 hf2b8a54_2 conda-forge/noarch Cached
> + cons 0.4.6 pyhd8ed1ab_0 conda-forge/noarch Cached
> + contourpy 1.3.0 py312hc5c4d5f_2 conda-forge/osx-64 Cached
> + cycler 0.12.1 pyhd8ed1ab_0 conda-forge/noarch Cached
> + etuples 0.3.9 pyhd8ed1ab_0 conda-forge/noarch Cached
> + expat 2.6.3 hac325c4_0 conda-forge/osx-64 Cached
> + filelock 3.16.1 pyhd8ed1ab_0 conda-forge/noarch Cached
> + font-ttf-dejavu-sans-mono 2.37 hab24e00_0 conda-forge/noarch Cached
> + font-ttf-inconsolata 3.000 h77eed37_0 conda-forge/noarch Cached
> + font-ttf-source-code-pro 2.038 h77eed37_0 conda-forge/noarch Cached
> + font-ttf-ubuntu 0.83 h77eed37_3 conda-forge/noarch Cached
> + fontconfig 2.14.2 h5bb23bf_0 conda-forge/osx-64 Cached
> + fonts-conda-ecosystem 1 0 conda-forge/noarch Cached
> + fonts-conda-forge 1 0 conda-forge/noarch Cached
> + fonttools 4.54.1 py312hb553811_0 conda-forge/osx-64 Cached
> + freetype 2.12.1 h60636b9_2 conda-forge/osx-64 Cached
> + fribidi 1.0.10 hbcb3906_0 conda-forge/osx-64 Cached
> + gdk-pixbuf 2.42.12 ha587570_0 conda-forge/osx-64 Cached
> + graphite2 1.3.13 h73e2aa4_1003 conda-forge/osx-64 Cached
> + graphviz 12.0.0 he14ced1_0 conda-forge/osx-64 Cached
> + gtk2 2.24.33 h2c15c3c_5 conda-forge/osx-64 Cached
> + gts 0.7.6 h53e17e3_4 conda-forge/osx-64 Cached
> + h5netcdf 1.4.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + h5py 3.11.0 nompi_py312hfc94b03_102 conda-forge/osx-64 Cached
> + harfbuzz 9.0.0 h098a298_1 conda-forge/osx-64 Cached
> + hdf5 1.14.3 nompi_h687a608_105 conda-forge/osx-64 Cached
> + icu 75.1 h120a0e1_0 conda-forge/osx-64 Cached
> + kiwisolver 1.4.7 py312hc5c4d5f_0 conda-forge/osx-64 Cached
> + krb5 1.21.3 h37d8d59_0 conda-forge/osx-64 Cached
> + lcms2 2.16 ha2f27b4_0 conda-forge/osx-64 Cached
> + ld64_osx-64 951.9 h38c89e5_1 conda-forge/osx-64 Cached
> + lerc 4.0.0 hb486fe8_0 conda-forge/osx-64 Cached
> + libaec 1.1.3 h73e2aa4_0 conda-forge/osx-64 Cached
> + libblas 3.9.0 22_osx64_openblas conda-forge/osx-64 Cached
> + libbrotlicommon 1.1.0 h00291cd_2 conda-forge/osx-64 Cached
> + libbrotlidec 1.1.0 h00291cd_2 conda-forge/osx-64 Cached
> + libbrotlienc 1.1.0 h00291cd_2 conda-forge/osx-64 Cached
> + libcblas 3.9.0 22_osx64_openblas conda-forge/osx-64 Cached
> + libclang-cpp17 17.0.6 default_hb173f14_7 conda-forge/osx-64 Cached
> + libcurl 8.10.1 h58e7537_0 conda-forge/osx-64 Cached
> + libcxx 19.1.1 hf95d169_0 conda-forge/osx-64 Cached
> + libcxx-devel 17.0.6 h8f8a49f_6 conda-forge/osx-64 Cached
> + libdeflate 1.22 h00291cd_0 conda-forge/osx-64 Cached
> + libedit 3.1.20191231 h0678c8f_2 conda-forge/osx-64 Cached
> + libev 4.33 h10d778d_2 conda-forge/osx-64 Cached
> + libexpat 2.6.3 hac325c4_0 conda-forge/osx-64 Cached
> + libffi 3.4.2 h0d85af4_5 conda-forge/osx-64 Cached
> + libgd 2.3.3 h2e77e4f_10 conda-forge/osx-64 Cached
> + libgfortran 5.0.0 13_2_0_h97931a8_3 conda-forge/osx-64 Cached
> + libgfortran5 13.2.0 h2873a65_3 conda-forge/osx-64 Cached
> + libglib 2.82.1 h63bbcf2_0 conda-forge/osx-64 Cached
> + libhwloc 2.11.1 default_h456cccd_1000 conda-forge/osx-64 Cached
> + libiconv 1.17 hd75f5a5_2 conda-forge/osx-64 Cached
> + libintl 0.22.5 hdfe23c8_3 conda-forge/osx-64 Cached
> + libjpeg-turbo 3.0.0 h0dc2134_1 conda-forge/osx-64 Cached
> + liblapack 3.9.0 22_osx64_openblas conda-forge/osx-64 Cached
> + liblapacke 3.9.0 22_osx64_openblas conda-forge/osx-64 Cached
> + libllvm17 17.0.6 hbedff68_1 conda-forge/osx-64 Cached
> + libnghttp2 1.58.0 h64cf6d3_1 conda-forge/osx-64 Cached
> + libopenblas 0.3.27 openmp_h8869122_1 conda-forge/osx-64 Cached
> + libpng 1.6.44 h4b8f8c9_0 conda-forge/osx-64 Cached
> + librsvg 2.58.4 h2682814_0 conda-forge/osx-64 Cached
> + libsqlite 3.46.1 h4b8f8c9_0 conda-forge/osx-64 Cached
> + libssh2 1.11.0 hd019ec5_0 conda-forge/osx-64 Cached
> + libtiff 4.7.0 h583c2ba_1 conda-forge/osx-64 Cached
> + libwebp-base 1.4.0 h10d778d_0 conda-forge/osx-64 Cached
> + libxcb 1.17.0 hf1f96e2_0 conda-forge/osx-64 Cached
> + libxml2 2.12.7 heaf3512_4 conda-forge/osx-64 Cached
> + libzlib 1.3.1 hd23fc13_2 conda-forge/osx-64 Cached
> + llvm-openmp 19.1.0 h56322cc_0 conda-forge/osx-64 Cached
> + llvm-tools 17.0.6 hbedff68_1 conda-forge/osx-64 Cached
> + logical-unification 0.4.6 pyhd8ed1ab_0 conda-forge/noarch Cached
> + macosx_deployment_target_osx-64 10.13 hbc8f3bb_1 conda-forge/noarch Cached
> + markdown-it-py 3.0.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + matplotlib-base 3.9.2 py312h30cc4df_1 conda-forge/osx-64 Cached
> + mdurl 0.1.2 pyhd8ed1ab_0 conda-forge/noarch Cached
> + minikanren 1.0.3 pyhd8ed1ab_0 conda-forge/noarch Cached
> + mkl 2023.2.0 h54c2260_50500 conda-forge/osx-64 Cached
> + mkl-service 2.4.0 py312h2402a68_1 conda-forge/osx-64 Cached
> + multipledispatch 0.6.0 pyhd8ed1ab_1 conda-forge/noarch Cached
> + munkres 1.1.4 pyh9f0ad1d_0 conda-forge/noarch Cached
> + ncurses 6.5 hf036a51_1 conda-forge/osx-64 Cached
> + numpy 1.26.4 py312he3a82b2_0 conda-forge/osx-64 Cached
> + openblas 0.3.27 openmp_hba01982_1 conda-forge/osx-64 Cached
> + openjpeg 2.5.2 h7310d3a_0 conda-forge/osx-64 Cached
> + openssl 3.3.2 hd23fc13_0 conda-forge/osx-64 Cached
> + packaging 24.1 pyhd8ed1ab_0 conda-forge/noarch Cached
> + pandas 2.2.3 py312h98e817e_1 conda-forge/osx-64 Cached
> + pango 1.54.0 h115fe74_2 conda-forge/osx-64 Cached
> + pcre2 10.44 h7634a1b_2 conda-forge/osx-64 Cached
> + pillow 10.4.0 py312h683ea77_1 conda-forge/osx-64 Cached
> + pip 24.2 pyh8b19718_1 conda-forge/noarch Cached
> + pixman 0.43.4 h73e2aa4_0 conda-forge/osx-64 Cached
> + pthread-stubs 0.4 h00291cd_1002 conda-forge/osx-64 Cached
> + pygments 2.18.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + pymc 5.17.0 hd8ed1ab_0 conda-forge/noarch Cached
> + pymc-base 5.17.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + pyparsing 3.1.4 pyhd8ed1ab_0 conda-forge/noarch Cached
> + pytensor 2.25.5 py312h9592d4c_0 conda-forge/osx-64 Cached
> + pytensor-base 2.25.5 py312h81f2e74_0 conda-forge/osx-64 Cached
> + python 3.12.7 h8f8b54e_0_cpython conda-forge/osx-64 Cached
> + python-dateutil 2.9.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + python-graphviz 0.20.3 pyhe28f650_1 conda-forge/noarch Cached
> + python-tzdata 2024.2 pyhd8ed1ab_0 conda-forge/noarch Cached
> + python_abi 3.12 5_cp312 conda-forge/osx-64 Cached
> + pytz 2024.1 pyhd8ed1ab_0 conda-forge/noarch Cached
> + qhull 2020.2 h3c5361c_5 conda-forge/osx-64 Cached
> + readline 8.2 h9e318b2_1 conda-forge/osx-64 Cached
> + rich 13.9.2 pyhd8ed1ab_0 conda-forge/noarch Cached
> + scipy 1.14.1 py312he82a568_0 conda-forge/osx-64 Cached
> + setuptools 75.1.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + sigtool 0.1.3 h88f4db0_0 conda-forge/osx-64 Cached
> + six 1.16.0 pyh6c4a22f_0 conda-forge/noarch Cached
> + tapi 1300.6.5 h390ca13_0 conda-forge/osx-64 Cached
> + tbb 2021.13.0 h37c8870_0 conda-forge/osx-64 Cached
> + threadpoolctl 3.5.0 pyhc1e730c_0 conda-forge/noarch Cached
> + tk 8.6.13 h1abcd95_1 conda-forge/osx-64 Cached
> + toolz 1.0.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + typing-extensions 4.12.2 hd8ed1ab_0 conda-forge/noarch Cached
> + typing_extensions 4.12.2 pyha770c72_0 conda-forge/noarch Cached
> + tzdata 2024b hc8b5060_0 conda-forge/noarch Cached
> + wheel 0.44.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + xarray 2024.9.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + xarray-einstats 0.8.0 pyhd8ed1ab_0 conda-forge/noarch Cached
> + xorg-libxau 1.0.11 h00291cd_1 conda-forge/osx-64 Cached
> + xorg-libxdmcp 1.1.5 h00291cd_0 conda-forge/osx-64 Cached
> + xz 5.2.6 h775f41a_0 conda-forge/osx-64 Cached
> + zlib 1.3.1 hd23fc13_2 conda-forge/osx-64 Cached
> + zstd 1.5.6 h915ae27_0 conda-forge/osx-64 Cached
> 
> Summary:
> 
> Install: 153 packages
> 
> Total download: 0 B
> 
> ───────────────────────────────────────────────────────────────────────────────────────────────────────────
> 
> Confirm changes: [Y/n] 
> Preparing transaction: done
> Verifying transaction: done
> Executing transaction: / 
> \ 
> done
> #
> # To activate this environment, use
> #
> # $ conda activate mypymc
> #
> # To deactivate an active environment, use
> #
> # $ conda deactivate
> 
> ```

PyMC ends up not working and throwing weird warnings. First, during `import` it throws the following WARNING which we have never had before and never on linux systems.

```auto
In [1]: import pymc as pm
WARNING (pytensor.tensor.blas): Using NumPy C-API based implementation for BLAS functions.

```

Next, PyMC fails to run with ImportErrors and CompileErrors:

```auto
In [2]: with pm.Model() as model:
   ...: latent_p = pm.Uniform('p', lower=0, upper=1)
   ...: x = pm.Binomial('x', n=100, p=latent_p, observed=20)
   ...: 
   ...: pm.model_to_graphviz(model)

You can find the C code in this temporary file: /var/folders/pf/lqt23xyj2kbcdc3fc0qghf10stfz88/T/pytensor_compilation_error_wzggj3yz
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/c/lazylinker_c.py:66
     65 if version != actual_version:
---> 66 raise ImportError(
     67 "Version check of the existing lazylinker compiled file."
     68 f" Looking for version {version}, but found {actual_version}. "
     69 f"Extra debug information: force_compile={force_compile}, _need_reload={_need_reload}"
     70 )
     71 except ImportError:

ImportError: Version check of the existing lazylinker compiled file. Looking for version 0.212, but found None. Extra debug information: force_compile=False, _need_reload=True

During handling of the above exception, another exception occurred:

ImportError Traceback (most recent call last)
File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/c/lazylinker_c.py:87
     86 if version != actual_version:
---> 87 raise ImportError(
     88 "Version check of the existing lazylinker compiled file."
     89 f" Looking for version {version}, but found {actual_version}. "
     90 f"Extra debug information: force_compile={force_compile}, _need_reload={_need_reload}"
     91 )
     92 except ImportError:
     93 # It is useless to try to compile if there isn't any
     94 # compiler! But we still want to try to load it, in case
     95 # the cache was copied from another computer.

ImportError: Version check of the existing lazylinker compiled file. Looking for version 0.212, but found None. Extra debug information: force_compile=False, _need_reload=True

During handling of the above exception, another exception occurred:

CompileError Traceback (most recent call last)
Cell In[2], line 5
      2 latent_p = pm.Uniform('p', lower=0, upper=1)
      3 x = pm.Binomial('x', n=100, p=latent_p, observed=20)
----> 5 pm.model_to_graphviz(model)

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pymc/model_graph.py:770, in model_to_graphviz(model, var_names, formatting, save, figsize, dpi, node_formatters, include_dim_lengths)
    766 model = pm.modelcontext(model)
    767 graph = ModelGraph(model)
    768 return make_graph(
    769 model.name,
--> 770 plates=graph.get_plates(var_names=var_names),
    771 edges=graph.edges(var_names=var_names),
    772 formatting=formatting,
    773 save=save,
    774 figsize=figsize,
    775 dpi=dpi,
    776 node_formatters=node_formatters,
    777 create_plate_label=create_plate_label_with_dim_length
    778 if include_dim_lengths
    779 else create_plate_label_without_dim_length,
    780 )

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pymc/model_graph.py:370, in ModelGraph.get_plates(self, var_names)
    363 # TODO: Evaluate all RV shapes at once
    364 # This should help find discrepencies, and
    365 # avoids unnecessary function compiles for determining labels.
    366 dim_lengths: dict[str, int] = {
    367 dim_name: fast_eval(value).item() for dim_name, value in self.model.dim_lengths.items()
    368 }
    369 var_shapes: dict[str, tuple[int, ...]] = {
--> 370 var_name: tuple(fast_eval(self.model[var_name].shape))
    371 for var_name in self.vars_to_plot(var_names)
    372 }
    374 for var_name in self.vars_to_plot(var_names):
    375 shape: tuple[int, ...] = var_shapes[var_name]

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pymc/model_graph.py:81, in fast_eval(var)
     80 def fast_eval(var):
---> 81 return function([], var, mode="FAST_COMPILE")()

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/compile/function/ __init__.py:318, in function(inputs, outputs, mode, updates, givens, no_default_updates, accept_inplace, name, rebuild_strict, allow_input_downcast, profile, on_unused_input)
    312 fn = orig_function(
    313 inputs, outputs, mode=mode, accept_inplace=accept_inplace, name=name
    314 )
    315 else:
    316 # note: pfunc will also call orig_function -- orig_function is
    317 # a choke point that all compilation must pass through
--> 318 fn = pfunc(
    319 params=inputs,
    320 outputs=outputs,
    321 mode=mode,
    322 updates=updates,
    323 givens=givens,
    324 no_default_updates=no_default_updates,
    325 accept_inplace=accept_inplace,
    326 name=name,
    327 rebuild_strict=rebuild_strict,
    328 allow_input_downcast=allow_input_downcast,
    329 on_unused_input=on_unused_input,
    330 profile=profile,
    331 output_keys=output_keys,
    332 )
    333 return fn

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/compile/function/pfunc.py:465, in pfunc(params, outputs, mode, updates, givens, no_default_updates, accept_inplace, name, rebuild_strict, allow_input_downcast, profile, on_unused_input, output_keys, fgraph)
    451 profile = ProfileStats(message=profile)
    453 inputs, cloned_outputs = construct_pfunc_ins_and_outs(
    454 params,
    455 outputs,
   (...)
    462 fgraph=fgraph,
    463 )
--> 465 return orig_function(
    466 inputs,
    467 cloned_outputs,
    468 mode,
    469 accept_inplace=accept_inplace,
    470 name=name,
    471 profile=profile,
    472 on_unused_input=on_unused_input,
    473 output_keys=output_keys,
    474 fgraph=fgraph,
    475 )

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/compile/function/types.py:1762, in orig_function(inputs, outputs, mode, accept_inplace, name, profile, on_unused_input, output_keys, fgraph)
   1750 m = Maker(
   1751 inputs,
   1752 outputs,
   (...)
   1759 fgraph=fgraph,
   1760 )
   1761 with config.change_flags(compute_test_value="off"):
-> 1762 fn = m.create(defaults)
   1763 finally:
   1764 if profile and fn:

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/compile/function/types.py:1654, in FunctionMaker.create(self, input_storage, storage_map)
   1651 start_import_time = pytensor.link.c.cmodule.import_time
   1653 with config.change_flags(traceback __limit=config.traceback__ compile_limit):
-> 1654 _fn, _i, _o = self.linker.make_thunk(
   1655 input_storage=input_storage_lists, storage_map=storage_map
   1656 )
   1658 end_linker = time.perf_counter()
   1660 linker_time = end_linker - start_linker

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/basic.py:245, in LocalLinker.make_thunk(self, input_storage, output_storage, storage_map, **kwargs)
    238 def make_thunk(
    239 self,
    240 input_storage: Optional["InputStorageType"] = None,
   (...)
    243 **kwargs,
    244 ) -> tuple["BasicThunkType", "InputStorageType", "OutputStorageType"]:
--> 245 return self.make_all(
    246 input_storage=input_storage,
    247 output_storage=output_storage,
    248 storage_map=storage_map,
    249 )[:3]

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/vm.py:1282, in VMLinker.make_all(self, profiler, input_storage, output_storage, storage_map)
   1279 else:
   1280 post_thunk_clear = None
-> 1282 vm = self.make_vm(
   1283 order,
   1284 thunks,
   1285 input_storage,
   1286 output_storage,
   1287 storage_map,
   1288 post_thunk_clear,
   1289 computed,
   1290 compute_map,
   1291 self.updated_vars,
   1292 )
   1294 vm.storage_map = storage_map
   1295 vm.compute_map = compute_map

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/vm.py:1010, in VMLinker.make_vm(self, nodes, thunks, input_storage, output_storage, storage_map, post_thunk_clear, computed, compute_map, updated_vars)
   1007 pre_call_clear = [storage_map[v] for v in self.no_recycling]
   1009 try:
-> 1010 from pytensor.link.c.cvm import CVM
   1011 except (MissingGXX, ImportError):
   1012 CVM = None

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/c/cvm.py:13
      9 if not config.cxx:
     10 raise MissingGXX(
     11 "lazylinker will not be imported if pytensor.config.cxx is not set."
     12 )
---> 13 from pytensor.link.c.lazylinker_c import CLazyLinker
     15 class CVM(CLazyLinker, VM):
     16 def __init__ (self, fgraph, *args, **kwargs):

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/c/lazylinker_c.py:122
    119 loc.mkdir(exist_ok=True)
    121 args = GCC_compiler.compile_args()
--> 122 GCC_compiler.compile_str(dirname, code, location=loc, preargs=args)
    123 # Save version into the __init__.py file.
    124 init_py = loc / " __init__.py"

File ~/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/c/cmodule.py:2654, in GCC_compiler.compile_str(module_name, src_code, location, include_dirs, lib_dirs, libs, preargs, py_module, hide_symbols)
   2646 print(
   2647 "Check if package python-dev or python-devel is installed."
   2648 )
   2650 # We replace '\n' by '. ' in the error message because when Python
   2651 # prints the exception, having '\n' in the text makes it more
   2652 # difficult to read.
   2653 # compile_stderr = compile_stderr.replace("\n", ". ")
-> 2654 raise CompileError(
   2655 f"Compilation failed (return status={status}):\n{' '.join(cmd)}\n{compile_stderr}"
   2656 )
   2657 elif config.cmodule__compilation_warning and compile_stderr:
   2658 # Print errors just below the command line.
   2659 print(compile_stderr)

CompileError: Compilation failed (return status=1):
/Users/zaccars/anaconda3/envs/mypymc/bin/clang++ -dynamiclib -g -Wno-c++11-narrowing -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -DNPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION -m64 -fPIC -undefined dynamic_lookup -I/Users/zaccars/anaconda3/envs/pymc/lib/python3.12/site-packages/numpy/core/include -I/Users/zaccars/anaconda3/envs/pymc/include/python3.12 -I/Users/zaccars/anaconda3/envs/pymc/lib/python3.12/site-packages/pytensor/link/c/c_code -L/Users/zaccars/anaconda3/envs/pymc/lib -fvisibility=hidden -o /Users/zaccars/.pytensor/compiledir_macOS-14.6.1-x86_64-i386-64bit-i386-3.12.7-64/lazylinker_ext/lazylinker_ext.so /Users/zaccars/.pytensor/compiledir_macOS-14.6.1-x86_64-i386-64bit-i386-3.12.7-64/lazylinker_ext/mod.cpp
dyld[91935]: Symbol not found: __ZNK4tapi2v119LinkerInterfaceFile28getPlatformsAndMinDeploymentEv
  Referenced from: <E33DCAC4-3116-3019-8003-432FB3E66FB4> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld
  Expected in: <9918D37F-F19F-30B9-B311-13829B79C3B0> /Users/zaccars/anaconda3/envs/mypymc/lib/libtapi.dylib
clang++: error: unable to execute command: Abort trap: 6
clang++: error: linker command failed due to signal (use -v to see invocation)

```

Can anyone please help fixing this please? We have also tried to re-install XCode and related command line tools. It is a new error and I am not sure where/when it started to happen but it seems to be occurring only on MacOS.

Thank you

---

<div class="post-metadata">

**Author:** ![cluhmann](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/cluhmann/32/3083_2.png) [@cluhmann](https://discourse.pymc.io/u/cluhmann)\
**Post date:** [October 7, 2024, 3:05pm UTC](https://discourse.pymc.io/t/importerror-and-compileerror-from-default-fresh-conda-installation/15932/2 "2024-10-07T15:05:02Z")

</div>

Please see the discussion in [this thread](https://discourse.pymc.io/t/problems-with-installation-of-pymc-after-xcode-update-on-mac/15097).