Can't install development environment

Numba Development
1 
conda create -n numbaenv python=3.10 numba/label/dev::llvmlite numpy scipy jinja2 cffi

LibMambaUnsatisfiableError: Encountered problems while solving:
  - nothing provides python 3.3* needed by llvmlite-0.1.0-py33_22

Could not solve for environment specs
The following packages are incompatible
└─ llvmlite is not installable because there are no viable options
   ├─ llvmlite [0.1.0|0.10.0|...|0.9.0] conflicts with any installable versions previously reported;
   ├─ llvmlite [0.1.0|0.2.0|...|0.9.0] would require
   │  └─ python 3.3* , which does not exist (perhaps a missing channel);
   └─ llvmlite 0.21.0 would require

conda --version

conda 24.9.2

I have mamba / miniforge3, perhaps that’s messing up everything?

2

I too have mambaforge3, but I get:

$ conda create -n numbaenvtest python=3.10 numba/label/dev::llvmlite numpy scipy jinja2 cffi
Retrieving notices: done
Channels:
 - conda-forge
 - numba/label/dev
Platform: linux-64
Collecting package metadata (repodata.json): done
Solving environment: done


==> WARNING: A newer version of conda exists. <==
    current version: 24.11.3
    latest version: 25.11.0

Please update conda by running

    $ conda update -n base -c conda-forge conda



## Package Plan ##

  environment location: /home/gmarkall/miniforge3/envs/numbaenvtest

  added / updated specs:
    - cffi
    - jinja2
    - numba/label/dev::llvmlite
    - numpy
    - python=3.10
    - scipy


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    cffi-2.0.0                 |  py310he7384ee_1         239 KB  conda-forge
    jinja2-3.1.6               |     pyhcf101f3_1         118 KB  conda-forge
    libblas-3.11.0             |4_h4a7cf45_openblas          18 KB  conda-forge
    libcblas-3.11.0            |4_h0358290_openblas          18 KB  conda-forge
    libgcc-15.2.0              |      he0feb66_15        1017 KB  conda-forge
    libgcc-ng-15.2.0           |      h69a702a_15          26 KB  conda-forge
    libgfortran-15.2.0         |      h69a702a_15          26 KB  conda-forge
    libgfortran5-15.2.0        |      h68bc16d_15         2.4 MB  conda-forge
    libgomp-15.2.0             |      he0feb66_15         589 KB  conda-forge
    liblapack-3.11.0           |4_h47877c9_openblas          18 KB  conda-forge
    libsqlite-3.51.1           |       h0c1763c_0         917 KB  conda-forge
    libstdcxx-15.2.0           |      h934c35e_15         5.6 MB  conda-forge
    libstdcxx-ng-15.2.0        |      hdf11a46_15          26 KB  conda-forge
    libuuid-2.41.2             |       h5347b49_1          39 KB  conda-forge
    llvmlite-0.47.0dev0        |  py310hbe36340_0        38.3 MB  numba/label/dev
    markupsafe-3.0.3           |  py310h3406613_0          23 KB  conda-forge
    python-3.10.19             |h3c07f61_2_cpython        24.1 MB  conda-forge
    scipy-1.15.2               |  py310h1d65ade_0        15.7 MB  conda-forge
    zstd-1.5.7                 |       hb78ec9c_6         587 KB  conda-forge
    ------------------------------------------------------------
                                           Total:        89.6 MB

The following NEW packages will be INSTALLED:

  _libgcc_mutex      conda-forge/linux-64::_libgcc_mutex-0.1-conda_forge 
  _openmp_mutex      conda-forge/linux-64::_openmp_mutex-4.5-2_gnu 
  bzip2              conda-forge/linux-64::bzip2-1.0.8-hda65f42_8 
  ca-certificates    conda-forge/noarch::ca-certificates-2025.11.12-hbd8a1cb_0 
  cffi               conda-forge/linux-64::cffi-2.0.0-py310he7384ee_1 
  jinja2             conda-forge/noarch::jinja2-3.1.6-pyhcf101f3_1 
  ld_impl_linux-64   conda-forge/linux-64::ld_impl_linux-64-2.45-default_hbd61a6d_104 
  libblas            conda-forge/linux-64::libblas-3.11.0-4_h4a7cf45_openblas 
  libcblas           conda-forge/linux-64::libcblas-3.11.0-4_h0358290_openblas 
  libexpat           conda-forge/linux-64::libexpat-2.7.3-hecca717_0 
  libffi             conda-forge/linux-64::libffi-3.5.2-h9ec8514_0 
  libgcc             conda-forge/linux-64::libgcc-15.2.0-he0feb66_15 
  libgcc-ng          conda-forge/linux-64::libgcc-ng-15.2.0-h69a702a_15 
  libgfortran        conda-forge/linux-64::libgfortran-15.2.0-h69a702a_15 
  libgfortran5       conda-forge/linux-64::libgfortran5-15.2.0-h68bc16d_15 
  libgomp            conda-forge/linux-64::libgomp-15.2.0-he0feb66_15 
  liblapack          conda-forge/linux-64::liblapack-3.11.0-4_h47877c9_openblas 
  liblzma            conda-forge/linux-64::liblzma-5.8.1-hb9d3cd8_2 
  libnsl             conda-forge/linux-64::libnsl-2.0.1-hb9d3cd8_1 
  libopenblas        conda-forge/linux-64::libopenblas-0.3.30-pthreads_h94d23a6_4 
  libsqlite          conda-forge/linux-64::libsqlite-3.51.1-h0c1763c_0 
  libstdcxx          conda-forge/linux-64::libstdcxx-15.2.0-h934c35e_15 
  libstdcxx-ng       conda-forge/linux-64::libstdcxx-ng-15.2.0-hdf11a46_15 
  libuuid            conda-forge/linux-64::libuuid-2.41.2-h5347b49_1 
  libxcrypt          conda-forge/linux-64::libxcrypt-4.4.36-hd590300_1 
  libzlib            conda-forge/linux-64::libzlib-1.3.1-hb9d3cd8_2 
  llvmlite           numba/label/dev/linux-64::llvmlite-0.47.0dev0-py310hbe36340_0 
  markupsafe         conda-forge/linux-64::markupsafe-3.0.3-py310h3406613_0 
  ncurses            conda-forge/linux-64::ncurses-6.5-h2d0b736_3 
  numpy              conda-forge/linux-64::numpy-2.2.6-py310hefbff90_0 
  openssl            conda-forge/linux-64::openssl-3.6.0-h26f9b46_0 
  pip                conda-forge/noarch::pip-25.3-pyh8b19718_0 
  pycparser          conda-forge/noarch::pycparser-2.22-pyh29332c3_1 
  python             conda-forge/linux-64::python-3.10.19-h3c07f61_2_cpython 
  python_abi         conda-forge/noarch::python_abi-3.10-8_cp310 
  readline           conda-forge/linux-64::readline-8.2-h8c095d6_2 
  scipy              conda-forge/linux-64::scipy-1.15.2-py310h1d65ade_0 
  setuptools         conda-forge/noarch::setuptools-80.9.0-pyhff2d567_0 
  tk                 conda-forge/linux-64::tk-8.6.13-noxft_ha0e22de_103 
  tzdata             conda-forge/noarch::tzdata-2025b-h78e105d_0 
  wheel              conda-forge/noarch::wheel-0.45.1-pyhd8ed1ab_1 
  zlib               conda-forge/linux-64::zlib-1.3.1-hb9d3cd8_2 
  zstd               conda-forge/linux-64::zstd-1.5.7-hb78ec9c_6 


Proceed ([y]/n)?

Did you truncate the error message? (at `llvmlite 0.21.0 would require"…)

3

Are you on an Intel Mac?

4

I’m on Linux amd. For now I just pip installed 0.45 and commented out the version check on import. Good enough for developing my simple feature

5

Here is the whole message:

conda create -n numbaenvtest python=3.10 numba/label/dev::llvmlite numpy scipy jinja2 cffi
Channels:
 - nodefaults
 - conda-forge
 - numba/label/dev
Platform: linux-64
Collecting package metadata (repodata.json): done
Solving environment: \ warning  libmamba Problem type not implemented SOLVER_RULE_STRICT_REPO_PRIORITY
warning  libmamba Problem type not implemented SOLVER_RULE_STRICT_REPO_PRIORITY
... warning repeated ad-nauseum
failed

LibMambaUnsatisfiableError: Encountered problems while solving:
  - nothing provides python 3.3* needed by llvmlite-0.1.0-py33_22

Could not solve for environment specs
The following packages are incompatible
└─ llvmlite is not installable because there are no viable options
   ├─ llvmlite [0.1.0|0.10.0|...|0.9.0] conflicts with any installable versions previously reported;
   ├─ llvmlite [0.1.0|0.2.0|...|0.9.0] would require
   │  └─ python 3.3* , which does not exist (perhaps a missing channel);
   └─ llvmlite 0.21.0 would require
      └─ libgcc-ng 7.2.0.* , which does not exist (perhaps a missing channel).
6

is it related to this: gha/ add version constraint for conda-libmamba-solver `<25.11` by swap357 · Pull Request #10359 · numba/numba · GitHub

7

Looks promising