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...lid 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(beta, yij, nij, nxrows, nxcols,xmat, & irequest, ierror) integer nxrows, nxcols, yij, nij, irequest, ierror double precision beta(nxrows), xmat(nxrows,nxcols) integer i i = 0 c fortran 95 version forall (i = 1:nxrows) beta(i) = i * 2 ierror = 0 end Regards, Joel Bremson UC Davis [[alternative HTML version deleted]]