This implementation is applicable to computer systems described in section 2.1 of the Installer's Notes (see Installer's Notes, Applicability).

Any additional information related to this implementation, that came to light after the release of this product, is described below.

1. Using gfortran version 4.7

   The libraries in this implementation have been tested with a newer version of gfortran

     GNU Fortran (GCC) 4.7.0
     Copyright (C) 2012 Free Software Foundation, Inc.
   

   and found to work correctly. It was necessary to recompile the NAG Library interface blocks for use with this newer compiler as described below.

2. Recompilation of NAG Library interface blocks for use with newer compiler versions

   This can be achieved by copying all the .f90 files from the nag_interface_blocks folder to a new folder of your choice, for example nag_interface_blocks_gfortran_4.7. Then compile all the files into objects using your compiler. Because the interface blocks contain some inter-dependencies, the order of compilation is important, but the following compilation order should work:

     gfortran -c -fdefault-integer-8 nag_precisions.f90
     gfortran -c -fdefault-integer-8 nag_blas_consts.f90
     gfortran -c -fdefault-integer-8 nag_a_ib.f90
     gfortran -c -fdefault-integer-8 nag_c_ib.f90
     gfortran -c -fdefault-integer-8 nag_d_ib.f90
     gfortran -c -fdefault-integer-8 nag_e_ib.f90
     gfortran -c -fdefault-integer-8 nag_f_ib.f90
     gfortran -c -fdefault-integer-8 nag_g_ib.f90
     gfortran -c -fdefault-integer-8 nag_h_ib.f90
     gfortran -c -fdefault-integer-8 nag_m_ib.f90
     gfortran -c -fdefault-integer-8 nag_p_ib.f90
     gfortran -c -fdefault-integer-8 nag_s_ib.f90
     gfortran -c -fdefault-integer-8 nag_x_ib.f90
     gfortran -c -fdefault-integer-8 nag_long_names.f90
     gfortran -c -fdefault-integer-8 nag_library.f90
   

   The object files generated by the compilation may be discarded - only the module files are needed. To use the newly compiled module files, you will need a compiler-dependent switch to tell the compiler where to find them when you are compiling programs. For example, the command

     gfortran -I nag_interface_blocks_gfortran_4.7
   

   will tell the compiler to look in the new folder for module files. Note that if you intend to use the nag_example* utilities that appear in the scripts directory, then you must modify them appropriately to refer to your new interface block directory instead of the original one.