I got my development environment working after a bit of messing around. I read the error message more closely and read about the dependency solver, and investigated the clcache package. It turns out that clcache has not been updated since February 2020. As the error message below clearly indicates, clcache-4.2.0 (the most recent release) has a dependency on python version no earlier than 3.10 and no later than 3.11.0a0), and newer pythons are not supported. By default conda installed (and pinned) python 3.13 which is the the latest stable version, thus the unsatisfied dependency.
I changed the conda python install command to python=3.10 and the rest of the installation carried off without a hitch. By the way, skipping the installation of clcache does not completely solve the problem because there were other packages that also needed an older version of python. It might help other newbies like me if the documentation in https://gdal.org/en/stable/development/dev_environment.html could be changed to conda install --yes --quiet curl libiconv icu git python=3.10 swig numpy pytest zlib although the law of the web is that even though this advice is right for today it will eventually become incorrect. Thanks, Tom On Fri, Jul 11, 2025, at 11:24 AM, Even Rouault wrote: > Tom, > > you can drop the clcache dependency if that helps. Otherwise try to > create a conda env from scratch (if you didn't do that) > > Even > > Le 11/07/2025 à 02:31, Tom Moore via gdal-dev a écrit : > > Newbie here. As the title says I am trying to set up a build environment. > > > > I was trying to follow the instructions from the website: > > https://gdal.org/en/stable/development/dev_environment.html > > > > I got to the step to install the compiler and got an error about > > conflicts and the process stopped. Does anyone have a clue about what > > is going wrong here?? Output follows: > > > > ===== start of output > > > > (gdal) C:\Users\tmoore> conda install --yes -c conda-forge compilers > > clcache > > Channels: > > - conda-forge > > - defaults > > Platform: win-64 > > Collecting package metadata (repodata.json): done > > Solving environment: failed > > > > LibMambaUnsatisfiableError: Encountered problems while solving: > > - nothing provides vc 10.* needed by python-3.4.5-0 > > > > Could not solve for environment specs > > The following packages are incompatible > > ├─ clcache =* * is installable with the potential options > > │ ├─ clcache 4.2.0 would require > > │ │ └─ python >=3.10,<3.11.0a0 *, which can be installed; > > │ ├─ clcache [4.1.0|4.2.0] would require > > │ │ └─ python >=3.8,<3.9.0a0 *, which can be installed; > > │ ├─ clcache [4.1.0|4.2.0] would require > > │ │ └─ python >=3.9,<3.10.0a0 *, which can be installed; > > │ ├─ clcache 3.3.0 would require > > │ │ └─ python =3.4 * but there are no viable options > > │ │ ├─ python 3.4.5 would require > > │ │ │ └─ vc =10 *, which does not exist (perhaps a missing channel); > > │ │ └─ python 3.4.5 would require > > │ │ └─ vs2010_runtime =* *, which does not exist (perhaps a > > missing channel); > > │ ├─ clcache [3.3.0|4.0.0|4.1.0] would require > > │ │ └─ python [=3.5 *|>=3.5,<3.6.0a0 *], which can be installed; > > │ ├─ clcache [4.0.0|4.1.0] would require > > │ │ └─ python =3.6 *, which can be installed; > > │ ├─ clcache [4.1.0|4.2.0] would require > > │ │ └─ python >=3.6,<3.7.0a0 *, which can be installed; > > │ └─ clcache 4.1.0 would require > > │ └─ python >=3.7,<3.8.0a0 *, which can be installed; > > └─ pin on python 3.13.* =* * is not installable because it requires > > └─ python =3.13 *, which conflicts with any installable versions > > previously reported. > > > > Pins seem to be involved in the conflict. Currently pinned specs: > > - python=3.13 > > > > ==== end of output > > > > Thanks, Tom > > > > > > > > _______________________________________________ > > gdal-dev mailing list > > gdal-dev@lists.osgeo.org > > https://lists.osgeo.org/mailman/listinfo/gdal-dev > > -- > http://www.spatialys.com > My software is free, but my time generally not. > >
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