I seem to be running into a bug with GenomicFeatures installation for Bioconductor 3.8 (Red Hat Linux 3.10.0-957.el7.x86_64):

> BiocManager::install("GenomicFeatures", version = "3.8")
Bioconductor version 3.8 (BiocManager 1.30.3), R 3.5.1
  (2018-07-02)
Installing package(s) 'GenomicFeatures'
Warning: package ‘GenomicFeatures’ is not available (for R version 3.5.1)

All other Bioconductor packages install correctly on my machine, and I can install GenomicFeatures from the GitHub repo. It seems to be an issue specific to BiocManager.

Best,
Mike

Depending on what OS you are using, GenomicFeatures has a TIMEOUT on linux and ERROR on windows as indicated by the build report. Until there is a successful build on that platform it will remain unavailable. We are looking into these build failures.