Dockerfile doesn't work with rocker/shiny:latest

[ernstki]

The rocker/shiny:latest image from Docker Hub installs R 3.6.something (as of this writing). The packrat.lock for DNAlandscapeR was created with R 3.3.2.

Simply cloning this repository and doing a docker build . will result in an error message along the lines of

error: '::Rf_pythag' has not been declared

as the package Rcpp is being built from source, which is fundamentally the same as the issue described here. Apparently some #define was removed from R a while ago, but the version of Rcpp in your packrat.lock still expects it to be there.

There might be some kind of workaround to get everything working by installing just a slightly newer version of Rcpp as detailed here (0.12.17, whereas the current in CRAN is 1.0.3).

I'm going to try just modifying the Dockerfile to use rocker/shiny:3.3.2 instead. I'll file a PR if that solves it.