On Tue, 26 Feb 2019 05:47:38 -0800 (PST) Rich Shepard <rshepard using appl-ecosys.com> wrote: > /usr/lib/R/library/later/libs/later.so: undefined symbol: > __atomic_fetch_add_8 Stackoverflow may help at least in locating the trouble. A web search indicates the error is not unknown in other contexts than R. JWDougherty