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...N_UNIT=-1 FLIBS=/home/jbremson/bin/irun/lib/libgfortran.a but when running an R CMD check on the package I see that it's still using g77 to compile: -----output---- ... ** libs g77 -fPIC -g -O2 -c estimate.f -o estimate.o estimate.f: In subroutine `estimate': estimate.f:20: forall (i = 1:nxrows) beta(i) = i * 2 ^ Invalid declaration of or reference to symbol `forall' at (^) [initially seen at (^)] ... ----end output ---- The code compiles using: gfortran -c estimate.f I can run my code if I build the .so by hand and then dyn.load it. Here is my F95 test code: subroutine estimate...