The problem is that you are using two different HDF5 libraries. When you did ./configure, you specified one library using e.g. LDFLAGS. When you run your program, you are linking to a different HDF5 library. You need to locate that second library and replace it with the one you specified at the time you ran ./configure. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: QGB-866955 Department: Support netCDF Priority: Normal Status: Closed