CODEWITHSUNDEEP
pythonanacondaconda
Migwell
Migwell

Reputation: 20117

How can I determine the channels I need to enable in order to install a conda package?

For instance, say I want to install the bioconda package gapfiller. 

conda new -n gapfiller -c bioconda -c conda-forge gapfiller

If I run the above command, I get the following error:

PackagesNotFoundError: The following packages are not available from current channels:

  - boost[version='>=1.57.0,<1.57.1.0a0']

Current channels:

  - https://conda.anaconda.org/bioconda/linux-64
  - https://conda.anaconda.org/bioconda/noarch
  - https://conda.anaconda.org/conda-forge/linux-64
  - https://conda.anaconda.org/conda-forge/noarch
  - https://repo.anaconda.com/pkgs/main/linux-64
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/r/linux-64
  - https://repo.anaconda.com/pkgs/r/noarch

At this point, what is the next step I should take to determine which channel I need to start including?

I've tried looking at the meta.yml for the package, but that only lists the packages that gapfiller depends on, not the channels that they can be found in. I've also tried conda search boost, but of course that only returns (incompatible) results in my current channels, it doesn't tell me how to find new channels:

$ conda search boost
Loading channels: done
# Name                       Version           Build  Channel             
boost                         1.65.1          py27_4  pkgs/main           
boost                         1.65.1  py27h0eb07c9_3  pkgs/main           
boost                         1.65.1          py35_4  pkgs/main           
boost                         1.65.1  py35heb9229b_3  pkgs/main           
boost                         1.65.1          py36_4  pkgs/main           
boost                         1.65.1  py36hfaba7b9_3  pkgs/main           
boost                         1.67.0          py27_4  pkgs/main           
boost                         1.67.0          py35_4  pkgs/main           
boost                         1.67.0          py36_4  pkgs/main           
boost                         1.67.0          py37_4  pkgs/main           
boost                         1.71.0          py38_0  pkgs/main

How can I determine the right channel to use to solve a PackagesNotFoundError?

Upvotes: 2

Views: 1093

Answers (1)

merv
merv

Reputation: 76740

Often, when it comes to old package versions, they got relegated to the free channel which was taken off the defaults metachannel last year. There are a few ways to add it back in (e.g., config setting restore_free_channel or env variable CONDA_RESTORE_FREE_CHANNEL), but a straightforward ad hoc solution is to include it as a one of the channels:

conda install -c free ...

For boost=1.57 on linux-64 platform, I see

conda search -c free boost=1.57[subdir='linux-64']
Loading channels: done
# Name                       Version           Build  Channel             
boost                         1.57.0               0  free                
boost                         1.57.0               1  free                
boost                         1.57.0               4  free

Upvotes: 2

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