Rserve is available in the library -
/Users/xxxxxxx/opt/anaconda3/envs/r_env/lib/R/bin/Rserve
(r_env) xxxxxxx@x86_64-apple-darwin13 bin % ps -eaf|grep -i rserve
501 3005 1 0 9:53PM ?? 0:00.14 /Users/xxxxxxx/opt/anaconda3/envs/r_env/lib/R/bin/Rserve
501 4366 70367 0 10:20PM ttys001 0:00.00 grep -i rserve
(r_env) xxxxxxx@x86_64-apple-darwin13 bin %