Ners runs under Linux or MAC OS.
Dependencies:
                                           
1) tcsh. Comment: tcsh should have symbolic link to csh.
         Old bsd csh is not supported.
2) gcc C compiler
3) Fortran compiler: either gfortran or Intel
4) wget ( https://www.gnu.org/software/wget )
5) Optionally, python version 3.2 or newer.

Ners can be configured in two modes: standalone and with dependency
to petools library. If you do not know what petools library is, 
probably, you should configure ners in the standalone mode,
i.e. without specifying --with-petools= as argument for configure.
Ners installs python module by default. If you do not want to use
the python module, you can configure python without python support
with specifying --without-python.

  To configure ners, run ./configure with arguments.
To see the list if arguments, run 

./configure -h

Script configure honors the following environment variables:

  CC      -- full path to C compiler (gcc by default)
  FC      -- full path to Fortran compiler (gfortran by default)
  LDFLAGS -- additional commands appended to the linker

When you configure ners with petools, you need to specify installation
directory for petools.

Example:

./configure --prefix=/opt64 FC=/opt64/bin/gfortran  --python-dir=/opt64/script

After you run configure, just execute

make
make example
make install

Installed files:

1) library ${NERS_PREFIX}/lib/libners.a
           ${NERS_PREFIX}/lib/libners.so    (Linux) or 
           ${NERS_PREFIX}/lib/libners.dylib (MacOS)

2) include files: 

           ${NERS_PREFIX}/include/ners.i
           ${NERS_PREFIX}/include/ners_local.i

4) python module:

           ${NERS_PYTHON}/ners.py

   where NERS_PYTHON is /usr/lib/pythonVERS/site-packages directory
   ( VERS is python version ) or the directory name specified by
   --python-dir directory.


3) executable:

   ${NERS_PREFIX}/bin/ners_eop    -- Program that prints the EOP value(s) on the requested epoch
   ${NERS_PREFIX}/bin/ners_eopser -- Program that prints the EOP time series on the requested 
                                     time range with requested time step
   ${NERS_PREFIX}/bin/ners_azel   -- Program that computes azimuth an elevation at a requested
                                     epoch for a station with given positions obsering a source 
                                     with given coordinates
   ${NERS_PREFIX}/bin/utcmtai     -- Program that prints UTC minus TAI
   ${NERS_PREFIX}/bin/ut1mtai     -- Program that prints UT1 minus TAI
   ${NERS_PRYTHON}/ners_python_get_eop_example.py    -- python example for EOP
   ${NERS_PRYTHON}/ners_python_azel_example.py       -- python example for azimuth and 
                                                        elevation computation
   ${NERS_PRYTHON}/ners_python_utc_to_tai_example.py -- python example for conversion UTC
                                                        time argument to TAI time
   ${NERS_PRYTHON}/ners_python_transform_example.py  -- python examples for various transformations

4) examples: 
   
   ${NERS_ROOT}/bin/ners_fortran_example_01
   ${NERS_ROOT}/bin/ners_fortran_example_02
   ${NERS_ROOT}/bin/ners_fortran_example_03
   ${NERS_ROOT}/bin/ners_fortran_example_04
   ${NERS_ROOT}/bin/ners_fortran_example_05
   ${NERS_ROOT}/bin/ners_c_example_01
   ${NERS_ROOT}/bin/ners_c_example_02
   ${NERS_ROOT}/bin/ners_c_example_03
   ${NERS_ROOT}/bin/ners_c_example_04
   ${NERS_ROOT}/bin/ners_c_example_05

   NB: examples are not installed. They remain in the root ners directory.   

5) data:

   ${NERS_PREFIX}/share/ners.config  -- Configuration file
   ${NERS_PREFIX}/share/ners.fcs     -- EOP forecast file. This file is frequently
                                        overwritten by ners library.
   ${NERS_PREFIX}/share/ners.leapsec -- Leap second file. This file is frequently
                                        overwritten by ners library.
6) documentation:

   ${NERS_PREFIX}/doc/

      ${NERS_PREFIX}/doc/ners_user_guide.html       User guide for ners library
      ${NERS_PREFIX}/doc/ners_api.txt               Application user interface
      ${NERS_PREFIX}/doc/ners_foreacst_message.txt  Contents of the EOP forecast message
      ${NERS_PREFIX}/doc/ners_configure.txt         NERS configuration options
      ${NERS_PREFIX}/doc/ners_eop.txt               User guide for program ners_eop
      ${NERS_PREFIX}/doc/ners_eopser.txt            User guide for program ners_eopser
      ${NERS_PREFIX}/doc/ut1mtai.txt                User guide for program ut1mtai
      ${NERS_PREFIX}/doc/utcmtai.txt                User guide for program utcmtai

In order to uninstall ners, just run

make uninstall 

Author: 

   Leonid Petrov

URL:

   http://earthrotation.net/ners

License:

   GNU Public License

Acknowledgment:

  This project was supported by NASA Earth Surface Interior program, grant NNX15AC10G.

Date of last modification:

2018.06.15