`later` package not compiling on MacOS ("unknown type name uuid_t")

This is a (meanwhile) known regression with Rcpp 1.0.4, c.f. http://lists.r-forge.r-project.org/pipermail/rcpp-devel/2020-March/010411.html

As a workaround you can install a fixed version from upstream's drat rpository, e.g.:

install.packages("Rcpp", repos="https://RcppCore.github.io/drat")
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