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...e rpart package, downloaded the source rpart_1.0-7.tar from CRAN and attempted a compilation. Everything works fine until the linking step, when I get: f77 -shared -o /users/etptupaf/R/library/rpart/libs/rpart.so anova.o anovapred.o branch.o bsplit.o choose_surg.o fix_cp.o free_tree.o gini.o graycode.o insert_split.o make_cp_list.o make_cp_table.o mysort.o nodesplit.o partition.o poisson.o poissonpred.o pred_rpart.o rpart.o rpcountup.o rplabel.o rpmatrix.o rundown.o rundown2.o s_to_rp.o s_xpred.o surrogate.o xval.o -lUfor -lfor -lFutil -lm -lots -lm ld: Warning: Unresolved: S_alloc What is S_...