#' Installs one or more packages using the libraries inside a conda environment
#'
#' @param packages A vector of package names to install. This is the same as the
#'  argument you would normally pass to `install.packages`
#' @param env The path to the conda environment that already has the dependencies installed into it
install_using_conda <- function(packages, env){
  env <- normalizePath(env)
  if (!"withr" %in% rownames(installed.packages())) install.packages("withr")
  withr::with_envvar(
    # Tell R where to find the pkgconfig
    c(PKG_CONFIG_PATH = file.path(env, "lib/pkgconfig")),
    withr::with_makevars(
      # Tell R to bake the library path into the compiled library
      c(LDFLAGS = paste0("-Wl,-rpath,", file.path(env, "lib"))),
      utils::install.packages(packages, type = "source"),
      assignment="+="
    )
  )
}