I've been trying to create a conda recipe to build archive. After much sleuthing, I tracked down an issue with Lines 2 and 9 in R/zzz.R

lib_path <- system.file("lib", .Platform$r_arch, paste0("libconnection", .Platform$dynlib.ext), package = "archive")

When I am building this using the default Mac OS X environment, .Platform$dynlib.ext is .so and so it happily finds libconnection.so and generates a full string for lib_path.

However, when I build this in a conda environment, .Platform$dynlib.ext is .dylib. This leads lib_path to being "", not finding libconnection.so and failing to load the library.

The solution that I've come up with is to replace those lines with

lib_path <- list.files(system.file("lib", package = "archive"), pattern="libconnection", full.names=TRUE)

I've tested this on a Mac OS X with R (>4.1) inside and outside of conda and it works.

I wonder whether you would have any interest in a pull request making this change.