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To activate the OpenMP extensions for C/C++ and Fortran, the compile-time 
flag -fopenmp must be specified.  This enables the OpenMP directive
#pragma omp in C/C++ and !$omp directives in free form, 
c$omp, *$omp and !$omp directives in fixed form, 
!$ conditional compilation sentinels in free form and c$,
*$ and !$ sentinels in fixed form, for Fortran.  The flag also
arranges for automatic linking of the OpenMP runtime library 
(Runtime Library Routines).
A complete description of all OpenMP directives accepted may be found in the OpenMP Application Program Interface manual, version 4.5.