== Build ROMS using gfortran on Win32 Machine ==

Below is the step by step procedure for a successful compilation of ROMS3.0 on a win32 machine under [wiki:Cygwin Cygwin].

  * '''Cygwin setup for gfortran'''

  In order for gfortran to work properly on [wiki:Cygwin Cygwin] make sure you have math packages [http://cran.r-project.org/doc/packages/gmp.pdf GMP] and [http://www.mpfr.org/ MPFR] installed on your machine. Open a Cygwin shell and type the following commands to confirm you have GMP and MPFR packages.

  ''$ cygcheck -c | grep gmp'' (If you see what is shown below then you're ok)

   gmp       4.2.1-1       OK
   
   libgmp3   4.2.1-1       OK


  ''$ cygcheck -c | grep mpfr'' (If you see what is shown below then you're ok)

   libmpfr1                2.2.1-1            OK

   mpfr                    2.2.1-1            OK

  If cygcheck fails to report the GMP and MPFR package installations, then install these packages using [wiki:Cygwin Cygwin] Setup. These packages are found under 'Libs' category in package installation list of cygwin setup.

  * '''Installing gfortran'''  
    * Get the latest [http://gcc.gnu.org/wiki/GFortranBinaries gfortran binary] for Cygwin. (e.g. gfortran-4.3-Cygwin-i686.tar.bz2)
    * Open a cygwin shell, locate the gfortran tar file, and type the following commands. This will install gfortran in /usr/local/bin and will be included in your search path.

    ''$ tar -xjvf gfortran-4.3-Cygwin-i686.tar.bz2  -C  /'' 

    ''$ ln -s /usr/local/gfortran/bin/gfortran.exe  /usr/local/bin/gfortran

    ''$ gfortran --version''  (You should see something as shown below to know that gfortran is working on your system)
  
    GNU Fortran (GCC) 4.3.0 20070512 (experimental)
    Copyright (C) 2007 Free Software Foundation, Inc.

    GNU Fortran comes with NO WARRANTY, to the extent permitted by law.
    You may redistribute copies of GNU Fortran
    under the terms of the GNU General Public License.
    For more information about these matters, see the file named COPYING

  
  * '''Building Netcdf and Netcdf-90 interface with gfortran support'''
    * Get the latest netcdf release ([http://www.unidata.ucar.edu/downloads/netcdf/ftp/netcdf.tar.gz netcdf-3.6.2] from Unidata.

  * '''Building ROMS'''