[gdal-dev] Problems setting up the Windows build environment for first time

[Even Rouault]

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
>
>
>
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