Declare a module’s R dependencies in its package.yaml under r-deps, using the canonical CRAN package name and a version constraint:

R packages are provisioned from the conda-forge package database, which mirrors CRAN as r-<name> feedstocks. You write the plain CRAN name; morloc lowercases it and prefixes r- when lowering, so ggplot2 above is installed as the conda package r-ggplot2. Do not write the r- prefix yourself.

conda is the default — and, for now, only — source, so the bare form above is equivalent to ggplot2: {version: ">=3.4", source: conda}. The cran and bioconductor sources (installing directly from those registries, compiling against the environment’s R) are recognized but not yet supported; declaring one is a build error today.

The r--prefixing applies only under conda-forge. An R dependency may instead draw from another conda channel (see the Python chapter), in which case the name is passed directly to that channel:

As with the other languages, the compiler takes the union of r-deps across every imported module and the solver intersects conflicting constraints. Only packages that exist as a conda-forge r- feedstock can be resolved this way; most of CRAN (and Bioconductor) is mirrored there.