# Version \`CXXABI\_1.3.15' not found when loading matplotlib through PythonCall

**URL:** https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671
**Category:** General Usage
**Tags:** package, pythoncall
**Created:** [August 18, 2025, 7:09am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671 "2025-08-18T07:09:41Z")
**Posts on this page:** 20
**Page:** 1

<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 18, 2025, 7:09am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/1 "2025-08-18T07:09:42Z")

</div>

Hi folks,

I want to call some functions from the Python package matplotlib in Julia through PythonCall.jl. However, it prompts `version 'CXXABI_1.3.15' not found`. Here is the error message:

```julia
julia> using PythonCall

julia> plt=pyimport("matplotlib")
ERROR: Python: ImportError: /home/.julia/juliaup/julia-1.10.10+0.x64.linux.gnu/bin/../lib/julia/libstdc++.so.6: version `CXXABI_1.3.15' not found (required by /data/julia-depot/environments/v1.10/.CondaPkg/.pixi/envs/default/lib/python3.12/site-packages/matplotlib/_c_internal_utils.cpython-312-x86_64-linux-gnu.so)

```

Within Python I can import matplotlib without error, but I just cannot do that in Julia. Does this mean that the `libstdc++` shipped in Julia is outdated? And how to solve it?

Thank you!

---

<div class="post-metadata">

### Author: ![giordano](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/giordano/32/2166_2.png) [@giordano](https://discourse.julialang.org/u/giordano)
#### Post date: [August 18, 2025, 8:24am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/2 "2025-08-18T08:24:34Z")

</div>

What version of Julia are you using?

---

<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 18, 2025, 2:44pm UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/3 "2025-08-18T14:44:54Z")

</div>

Hi Mosè, I tried both v1.11.6 and v1.10.10.

On another computer running v1.11.5, however, I can successfully `pyimport("matplotlab")`.

---

<div class="post-metadata">

### Author: ![giordano](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/giordano/32/2166_2.png) [@giordano](https://discourse.julialang.org/u/giordano)
#### Post date: [August 18, 2025, 2:51pm UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/4 "2025-08-18T14:51:19Z")

</div>

I believe the problem is that the system libstdc++ on your fist machine is old, which would explain why it works on the second machine but not on the first.

---

<div class="post-metadata">

### Author: ![cjdoris](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cjdoris/32/213133_2.png) [@cjdoris](https://discourse.julialang.org/u/cjdoris)
#### Post date: [August 18, 2025, 5:58pm UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/5 "2025-08-18T17:58:57Z")

</div>

Can you post the full output from `versioninfo()` and `CondaPkg.resolve(force=true)` in the non-working environment please, assuming you are using the default CondaPkg to install python dependencies.

---

<div class="post-metadata">

### Author: ![Palli](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/palli/32/3380_2.png) [@Palli](https://discourse.julialang.org/u/Palli)
#### Post date: [August 18, 2025, 7:17pm UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/6 "2025-08-18T19:17:47Z")

</div>

This seems to be a conflict between Python version and Julia version. Your Python could be too new (and/or Julia too new).

Please show what this gives you:

```julia-auto
julia> sys=pyimport("sys"); sys.version_info
Python: sys.version_info(major=3, minor=12, micro=11, releaselevel='final', serial=0)

julia> VERSION
v"1.11.6"

```

This works for me in Julia 1.10.10 but not in 1.11.6. If I recall, it’s because Python 3.12 changed from older and/or change in Julia.

This file works for me in 1.11 (but not if I ask for Python 3.13):  
.julia/environments/v1.11/CondaPkg.toml

```julia-auto
[deps]
# conda-forge = ""
numpy = ""
python = "==3.10" # before "" # "==3.13"
matplotlib = ""
# openssl = ">=3.3.2,<4.0a0"

```

---

<div class="post-metadata">

### Author: ![ufechner7](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ufechner7/32/51363_2.png) [@ufechner7](https://discourse.julialang.org/u/ufechner7)
#### Post date: [August 18, 2025, 8:16pm UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/7 "2025-08-18T20:16:45Z")

</div>

Try something along the lines:

```julia-auto
export LD_LIBRARY_PATH=~/.julia/conda/3/x86_64/lib:~/.julia/juliaup/

```

Does that help?

---

<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 19, 2025, 6:01am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/8 "2025-08-19T06:01:36Z")

</div>

Sure. Here is the output:

```julia
julia> versioninfo()
Julia Version 1.10.10
Commit 95f30e51f41 (2025-06-27 09:51 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 64 × Intel(R) Xeon(R) Gold 6242 CPU @ 2.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-15.0.7 (ORCJIT, cascadelake)
Threads: 1 default, 0 interactive, 1 GC (on 64 virtual cores)
Environment:
  LD_LIBRARY_PATH = /opt/FJSVxtclanga/tcsds-1.2.41/lib64:/home/apps/oss/mscp/lib64
  LD_LIBRARY_PATH_modshare = /opt/FJSVxtclanga/tcsds-1.2.41/lib64:1:/home/apps/oss/mscp/lib64:1
  JULIA_CONDAPKG_BACKEND = Pixi

julia> CondaPkg.resolve(force=true)
    CondaPkg Found dependencies: /home/.julia/environments/v1.10/CondaPkg.toml
    CondaPkg Found dependencies: /home/.julia/packages/PythonCall/avYrV/CondaPkg.toml
    CondaPkg Initialising pixi
             │ /home/.julia/artifacts/cefba4912c2b400756d043a2563ef77a0088866b/bin/pixi
             │ init
             │ --format pixi
             └ /home/.julia/environments/v1.10/.CondaPkg
Created /vol0004/mdt0/home/.julia/environments/v1.10/.CondaPkg/pixi.toml
    CondaPkg Wrote /home/.julia/environments/v1.10/.CondaPkg/pixi.toml
             │ [dependencies]
             │ openssl = ">=3, <3.6"
             │ libstdcxx-ng = ">=3.4,<14.0"
             │ yt = "*"
             │
             │ [dependencies.python]
             │ channel = "conda-forge"
             │ build = "*cpython*"
             │ version = ">=3.8,<4"
             │
             │ [project]
             │ name = ".CondaPkg"
             │ platforms = ["linux-64"]
             │ channels = ["conda-forge"]
             │ channel-priority = "strict"
             └ description = "automatically generated by CondaPkg.jl"
    CondaPkg Installing packages
             │ /home/.julia/artifacts/cefba4912c2b400756d043a2563ef77a0088866b/bin/pixi
             │ update
             └ --manifest-path /home/.julia/environments/v1.10/.CondaPkg/pixi.toml
Environment: default
  + C _libgcc_mutex 0.1 conda_forge
  + C _openmp_mutex 4.5 2_gnu
  + C asttokens 3.0.0 pyhd8ed1ab_1
  + C brotli 1.1.0 hb9d3cd8_3
  + C brotli-bin 1.1.0 hb9d3cd8_3
  + C bzip2 1.0.8 h4bc722e_7
  + C ca-certificates 2025.8.3 hbd8a1cb_0
  + C cmyt 2.0.2 pyhd8ed1ab_0
  + C colorama 0.4.6 pyhd8ed1ab_1
  + C comm 0.2.3 pyhe01879c_0
  + C contourpy 1.3.3 py312hd9148b4_1
  + C cpython 3.12.11 py312hd8ed1ab_0
  + C cycler 0.12.1 pyhd8ed1ab_1
  + C decorator 5.2.1 pyhd8ed1ab_0
  + C ewah-bool-utils 1.3.0 py312hcbe3ca9_0
  + C exceptiongroup 1.3.0 pyhd8ed1ab_0
  + C executing 2.2.0 pyhd8ed1ab_0
  + C fonttools 4.59.1 py312h8a5da7c_0
  + C freetype 2.13.3 ha770c72_1
  + C gmp 6.3.0 hac33072_2
  + C gmpy2 2.2.1 py312h7201bc8_0
  + C ipython 9.4.0 pyhfa0c392_0
  + C ipython_pygments_lexers 1.1.1 pyhd8ed1ab_0
  + C ipywidgets 8.1.7 pyhd8ed1ab_0
  + C jedi 0.19.2 pyhd8ed1ab_1
  + C jupyterlab_widgets 3.0.15 pyhd8ed1ab_0
  + C kiwisolver 1.4.9 py312h0a2e395_0
  + C lcms2 2.17 h717163a_0
  + C ld_impl_linux-64 2.44 h1423503_1
  + C lerc 4.0.0 h0aef613_1
  + C libblas 3.9.0 34_h59b9bed_openblas
  + C libbrotlicommon 1.1.0 hb9d3cd8_3
  + C libbrotlidec 1.1.0 hb9d3cd8_3
  + C libbrotlienc 1.1.0 hb9d3cd8_3
  + C libcblas 3.9.0 34_he106b2a_openblas
  + C libdeflate 1.24 h86f0d12_0
  + C libexpat 2.7.1 hecca717_0
  + C libffi 3.4.6 h2dba641_1
  + C libfreetype 2.13.3 ha770c72_1
  + C libfreetype6 2.13.3 h48d6fc4_1
  + C libgcc 15.1.0 h767d61c_4
  + C libgcc-ng 15.1.0 h69a702a_4
  + C libgfortran 15.1.0 h69a702a_4
  + C libgfortran5 15.1.0 hcea5267_4
  + C libgomp 15.1.0 h767d61c_4
  + C libjpeg-turbo 3.1.0 hb9d3cd8_0
  + C liblapack 3.9.0 34_h7ac8fdf_openblas
  + C liblzma 5.8.1 hb9d3cd8_2
  + C libnsl 2.0.1 hb9d3cd8_1
  + C libopenblas 0.3.30 pthreads_h94d23a6_2
  + C libpng 1.6.50 h421ea60_1
  + C libsqlite 3.50.4 h0c1763c_0
  + C libstdcxx 15.1.0 h8f9b012_4
  + C libstdcxx-ng 13.2.0 hc0a3c3a_7
  + C libtiff 4.7.0 h8261f1e_6
  + C libuuid 2.38.1 h0b41bf4_0
  + C libwebp-base 1.6.0 hd42ef1d_0
  + C libxcb 1.17.0 h8a09558_0
  + C libxcrypt 4.4.36 hd590300_1
  + C libzlib 1.3.1 hb9d3cd8_2
  + C matplotlib-base 3.10.5 py312he3d6523_0
  + C matplotlib-inline 0.1.7 pyhd8ed1ab_1
  + C more-itertools 10.7.0 pyhd8ed1ab_0
  + C mpc 1.3.1 h24ddda3_1
  + C mpfr 4.2.1 h90cbb55_3
  + C mpmath 1.3.0 pyhd8ed1ab_1
  + C munkres 1.1.4 pyhd8ed1ab_1
  + C ncurses 6.5 h2d0b736_3
  + C numpy 2.3.2 py312h33ff503_0
  + C openjpeg 2.5.3 h55fea9a_1
  + C openssl 3.5.2 h26f9b46_0
  + C packaging 25.0 pyh29332c3_1
  + C parso 0.8.4 pyhd8ed1ab_1
  + C pexpect 4.9.0 pyhd8ed1ab_1
  + C pickleshare 0.7.5 pyhd8ed1ab_1004
  + C pillow 11.3.0 py312h80c1187_0
  + C prompt-toolkit 3.0.51 pyha770c72_0
  + C pthread-stubs 0.4 hb9d3cd8_1002
  + C ptyprocess 0.7.0 pyhd8ed1ab_1
  + C pure_eval 0.2.3 pyhd8ed1ab_1
  + C pygments 2.19.2 pyhd8ed1ab_0
  + C pyparsing 3.2.3 pyhe01879c_2
  + C python 3.12.11 h9e4cc4f_0_cpython
  + C python-dateutil 2.9.0.post0 pyhe01879c_2
  + C python_abi 3.12 8_cp312
  + C qhull 2020.2 h434a139_5
  + C readline 8.2 h8c095d6_2
  + C six 1.17.0 pyhe01879c_1
  + C stack_data 0.6.3 pyhd8ed1ab_1
  + C sympy 1.14.0 pyh2585a3b_105
  + C tk 8.6.13 noxft_hd72426e_102
  + C tomli-w 1.2.0 pyhd8ed1ab_0
  + C tqdm 4.67.1 pyhd8ed1ab_1
  + C traitlets 5.14.3 pyhd8ed1ab_1
  + C typing_extensions 4.14.1 pyhe01879c_0
  + C tzdata 2025b h78e105d_0
  + C unicodedata2 16.0.0 py312h66e93f0_0
  + C unyt 3.0.4 pyhd8ed1ab_0
  + C wcwidth 0.2.13 pyhd8ed1ab_1
  + C widgetsnbextension 4.0.14 pyhd8ed1ab_0
  + C xorg-libxau 1.0.12 hb9d3cd8_0
  + C xorg-libxdmcp 1.1.5 hb9d3cd8_0
  + C yt 4.4.1 py312hf79963d_0
  + C zstd 1.5.7 hb8e6e7a_2

```

I am running on the Fugaku supercomputer.

---

<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 19, 2025, 6:08am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/9 "2025-08-19T06:08:04Z")

</div>

I am currently using Python 3.12.11 and Julia 1.10.10.

I can import numpy without error, but not for matplotlib ☹

```julia
julia> pyimport("numpy")
Python: <module 'numpy' from '/home/.julia/environments/v1.10/.CondaPkg/.pixi/envs/default/lib/python3.12/site-packages/numpy/ __init__.py'>

julia> pyimport("matplotlib")
ERROR: Python: ImportError: /vol0004/mdt0/home/.julia/juliaup/julia-1.10.10+0.x64.linux.gnu/bin/../lib/julia/libstdc++.so.6: version `CXXABI_1.3.15' not found (required by /home/.julia/environments/v1.10/.CondaPkg/.pixi/envs/default/lib/python3.12/site-packages/matplotlib/_c_internal_utils.cpython-312-x86_64-linux-gnu.so)
Python stacktrace:
 [1] <module>
   @ ~/.julia/environments/v1.10/.CondaPkg/.pixi/envs/default/lib/python3.12/site-packages/matplotlib/cbook.py:32
 [2] <module>
   @ ~/.julia/environments/v1.10/.CondaPkg/.pixi/envs/default/lib/python3.12/site-packages/matplotlib/ __init__.py:161
Stacktrace:
 [1] pythrow()
   @ PythonCall.Core ~/.julia/packages/PythonCall/avYrV/src/Core/err.jl:89
 [2] errcheck
   @ ~/.julia/packages/PythonCall/avYrV/src/Core/err.jl:10 [inlined]
 [3] pyimport(m::String)
   @ PythonCall.Core ~/.julia/packages/PythonCall/avYrV/src/Core/builtins.jl:1560
 [4] top-level scope
   @ REPL[4]:1

```

---

<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 19, 2025, 6:12am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/10 "2025-08-19T06:12:45Z")

</div>

Thank you Uwe, I saw your post about installing PyPlot and tried your solution, but it is not working for my situation. It still prompts the same error.

```julia
julia> versioninfo()
Julia Version 1.10.10
Commit 95f30e51f41 (2025-06-27 09:51 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 64 × Intel(R) Xeon(R) Gold 6242 CPU @ 2.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-15.0.7 (ORCJIT, cascadelake)
Threads: 1 default, 0 interactive, 1 GC (on 64 virtual cores)
Environment:
  LD_LIBRARY_PATH = /home/.julia/conda/3/x86_64/lib:/home/.julia/juliaup/
  LD_LIBRARY_PATH_modshare = /opt/FJSVxtclanga/tcsds-1.2.41/lib64:1:/home/apps/oss/mscp/lib64:1
  JULIA_CONDAPKG_BACKEND = Pixi

julia> using PythonCall

julia> pyimport("matplotlib")
ERROR: Python: ImportError: /vol0004/mdt0/home/.julia/juliaup/julia-1.10.10+0.x64.linux.gnu/bin/../lib/julia/libstdc++.so.6: version `CXXABI_1.3.15' not found (required by /home/.julia/environments/v1.10/.CondaPkg/.pixi/envs/default/lib/python3.12/site-packages/matplotlib/_c_internal_utils.cpython-312-x86_64-linux-gnu.so)

```

---

<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 19, 2025, 6:20am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/11 "2025-08-19T06:20:52Z")

</div>

Sorry for this naive question, the error message says ` ImportError: /vol0004/mdt0/home/u13411/.julia/juliaup/julia-1.10.10+0.x64.linux.gnu/bin/../lib/julia/libstdc++.so.6: version 'CXXABI_1.3.15' not found`, does this mean that Julia is looking for `CXXABI_1.3.15` in its own libstdc++?

It is quite strange that my scripts have been working well with matplotlib well on this HPC for more than 6 months. After I updating Julia packages last Sunday, the `version 'CXXABI_1.3.15' not found` error appears. I really don’t know which part did I break…

---

<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 19, 2025, 8:01am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/12 "2025-08-19T08:01:34Z")

</div>

Finally I tried to revert matplotlib’s version to `3.10.0`, and now I can successfully `pyimport("matplotlib")`.

I still don’t know why I can import matplotlib@3.10.5 in Python but cannot in Julia. Maybe because I am running on an old system🤔

---

<div class="post-metadata">

### Author: ![Palli](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/palli/32/3380_2.png) [@Palli](https://discourse.julialang.org/u/Palli)
#### Post date: [August 19, 2025, 8:32am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/13 "2025-08-19T08:32:37Z")

</div>

EDIT: I think I read wrong (not sure why worked for me, not you): That’s a different kind or error, …

---

<div class="post-metadata">

### Author: ![cjdoris](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cjdoris/32/213133_2.png) [@cjdoris](https://discourse.julialang.org/u/cjdoris)
#### Post date: [August 19, 2025, 8:36am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/14 "2025-08-19T08:36:36Z")

</div>

The issue is indeed an incompatibility between the version of libstdc++ shipped with Julia and the (newer) one expected by matplotlib.

The compat bound `libstdcxx-ng = ">=3.4,<14.0"` that you see in the `CondaPkg.resolve()` output is supposed to solve this, by restricting Conda to only expect versions older than what is in Julia (because older versions will be ABI compatible with what is loaded).

However the error you are seeing suggests that actually libstdc++ 14.1 is expected, which is outside of this range.

Conda has installed libstdcxx-ng 13.2 but libstdcxx 15.1, which I suspect is the problem. CondaPkg doesn’t restrict the latter.

Can you try running the following and then see if matplotlib works?

```julia-auto
CondaPkg.add("libstdcxx", version="<14.0")

```

---

<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 19, 2025, 8:55am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/15 "2025-08-19T08:55:52Z")

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Yeah it works! Thank you!

After using `CondaPkg.add("libstdcxx", version="<14.0")`, matplotlib is automatically downgraded from v3.10.5 to v3.10.3, and I can `pyimport` without error now.

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### Author: ![Palli](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/palli/32/3380_2.png) [@Palli](https://discourse.julialang.org/u/Palli)
#### Post date: [August 19, 2025, 9:03am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/16 "2025-08-19T09:03:20Z")

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That needs to be worked out in the future, to be able to use latest version of some packages like matplotlib, so here is only a partial solution, workaround. I don’t know what you’re missing out on in that later (minor, actually patch version) matplotlib… consider using Makie (or Plots).

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### Author: ![cjdoris](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cjdoris/32/213133_2.png) [@cjdoris](https://discourse.julialang.org/u/cjdoris)
#### Post date: [August 19, 2025, 9:20am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/17 "2025-08-19T09:20:02Z")

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> [@zhzhang](#):
>
> Yeah it works! Thank you!
> 
> After using `CondaPkg.add("libstdcxx", version="<14.0")`, matplotlib is automatically downgraded from v3.10.5 to v3.10.3, and I can `pyimport` without error now.

Great! I’ll add this fix into CondaPkg so you won’t need this workaround in the future.

The libstdcxx meta-package is only a year old, which is why CondaPkg missed it. I only discovered it via this thread.

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<div class="post-metadata">

### Author: ![zhzhang](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zhzhang/32/218317_2.png) [@zhzhang](https://discourse.julialang.org/u/zhzhang)
#### Post date: [August 19, 2025, 9:22am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/18 "2025-08-19T09:22:21Z")

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Yes, my workflow is relying on a Python package `yt` to read AMReX data, then plot the post-processed data with Makie, which works perfectly as I am more familiar with Julia ecosystem.

However `yt` depends on matplotlib (although I don’t need it in my workflow), so I couldn’t use `yt` earlier because of the incompatibility of matplotlib. I thought users of matplotlib must be more than those of yt, so I mentioned matplotlib in the title : )

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### Author: ![cjdoris](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cjdoris/32/213133_2.png) [@cjdoris](https://discourse.julialang.org/u/cjdoris)
#### Post date: [August 19, 2025, 9:40am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/19 "2025-08-19T09:40:00Z")

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Here are the relevant issues on GitHub if you’d like to track them.

> <https://github.com/JuliaPy/CondaPkg.jl/issues/192>
>
> Conda-forge recently (a year ago) added a new meta-package for libstdc++ called …libstdcxx. We should add special handling for it the same as for libstdcxx-ng.
> 
> And then use it in PythonCall.
> 
> See https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/17?u=cjdoris

> <https://github.com/JuliaPy/PythonCall.jl/issues/655>
>
> When https://github.com/JuliaPy/CondaPkg.jl/issues/192 is fixed and released, ad…d a a bound on libstdcxx to CondaPkg.toml here.

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<div class="post-metadata">

### Author: ![ufechner7](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ufechner7/32/51363_2.png) [@ufechner7](https://discourse.julialang.org/u/ufechner7)
#### Post date: [August 19, 2025, 10:03am UTC](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671/20 "2025-08-19T10:03:02Z")

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Will this also fix the issue with PyCall, or do we need a extra issue for that?

[Next page](https://discourse.julialang.org/t/version-cxxabi-1-3-15-not-found-when-loading-matplotlib-through-pythoncall/131671.md?page=2)