Hi,
You should read the pfg90-nolibs.make in the siesta-x.y/Src/Sys directory .... # # Important (at least for V5.0-1 of the pgf90 compiler...) # Compile atom.f without optimization. # atom.o: $(FC) -c $(FFLAGS_DEBUG) atom.f # I hope this will help you Best Sébastien Le Roux