Set environment variables for compilers

The sample :ref:`GNU <env-files-gnu10>` and :ref:`Intel <env-files-intel19>` environment files set the environment variables listed below in order to select the desired C, C++, and Fortran compilers:

Note

GEOS-Chem Classic only requires the Fortran compiler. But you will also need the C and C++ compilers if you plan to build other software packages (:ref:`such as KPP <kppguide>`) or :ref:`install libraries manually <build-libraries-with-spack>`.

Environment variables that specify compilers

Variable	Specifies the:	GNU name	Intel name
:envvar:`CC`	C compiler	:envvar:`gcc`	:envvar:`icc`
:envvar:`CXX`	C++ compiler	:envvar:`g++`	:envvar:`icpc`
:envvar:`FC`	Fortran compiler	:envvar:`gfortran`	:envvar:`ifort`

The commands used to define :envvar:`CC`, :envvar:`CXX`, and :envvar:`FC` are:

# for GNU
export CC=gcc
export CXX=g++
export FC=gfortran

or

# for Intel
export CC=icc
export CXX=icpc
export FC=ifort

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