In versions before 4.2, the Fortran netCDF library source was bundled with the C library source in one distribution, and it was possible to combine the libraries in a single library file. With version 4.2, the Fortran netCDF library for Fortran77 and Fortran90 APIs has been separated into its own source distribution, and should now be built as a separate library, after the C library is built and installed. This separation simplifies the building and use of the C and Fortran netCDF libraries and allows them to evolve independently.