bioc_install_repos()
deduces the URLs of the BioConductor repositories.
Both functions observe the R_BIOC_VERSION
environment variable, which
can be set to force a Bioconductor version. If this is set, then the
r_ver
and bioc_ver
arguments are ignored.
bioc_install_repos()
observes the R_BIOC_MIRROR
enironment variable
and also the BioC_mirror
option, which can be set to the desired
Bioconductor mirror. The option takes precedence if both are set. Its
default value is https://bioconductor.org
.