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/usr/include/sundials/sundials_config.h is in libsundials-serial-dev 2.5.0-3ubuntu1.

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/*
 * -----------------------------------------------------------------
 * $Revision: 1.6 $
 * $Date: 2010/12/15 22:45:17 $
 * ----------------------------------------------------------------- 
 * Programmer(s): Aaron Collier and Radu Serban @ LLNL
 * -----------------------------------------------------------------
 * Copyright (c) 2005, The Regents of the University of California.
 * Produced at the Lawrence Livermore National Laboratory.
 * All rights reserved.
 * For details, see the LICENSE file.
 *------------------------------------------------------------------
 * SUNDIALS configuration header file
 *------------------------------------------------------------------
 */

/* Define SUNDIALS version number */
#define SUNDIALS_PACKAGE_VERSION "2.5.0"

/* FCMIX: Define Fortran name-mangling macro for C identifiers.
 * Depending on the inferred scheme, one of the following six
 * macros will be defined:
 *     #define SUNDIALS_F77_FUNC(name,NAME) name
 *     #define SUNDIALS_F77_FUNC(name,NAME) name ## _
 *     #define SUNDIALS_F77_FUNC(name,NAME) name ## __
 *     #define SUNDIALS_F77_FUNC(name,NAME) NAME
 *     #define SUNDIALS_F77_FUNC(name,NAME) NAME ## _
 *     #define SUNDIALS_F77_FUNC(name,NAME) NAME ## __
 */
#define SUNDIALS_F77_FUNC(name,NAME) name ## _

/* FCMIX: Define Fortran name-mangling macro for C identifiers
 *        which contain underscores.
 */
#define SUNDIALS_F77_FUNC_(name,NAME) name ## _

/* Define precision of SUNDIALS data type 'realtype' 
 * Depending on the precision level, one of the following 
 * three macros will be defined:
 *     #define SUNDIALS_SINGLE_PRECISION 1
 *     #define SUNDIALS_DOUBLE_PRECISION 1
 *     #define SUNDIALS_EXTENDED_PRECISION 1
 */
#define SUNDIALS_DOUBLE_PRECISION 1

/* Use generic math functions 
 * If it was decided that generic math functions can be used, then
 *     #define SUNDIALS_USE_GENERIC_MATH
 */
#define SUNDIALS_USE_GENERIC_MATH

/* Blas/Lapack available
 * If working libraries for Blas/lapack support were found, then
 *     #define SUNDIALS_BLAS_LAPACK 1
 * otherwise
 *     #define SUNDIALS_BLAS_LAPACK 0
 */
#define SUNDIALS_BLAS_LAPACK 1

/* FNVECTOR: Allow user to specify different MPI communicator
 * If it was found that the MPI implementation supports MPI_Comm_f2c, then
 *      #define SUNDIALS_MPI_COMM_F2C 1
 * otherwise
 *      #define SUNDIALS_MPI_COMM_F2C 0
 */


/* Mark SUNDIALS API functions for export/import
 * When building shared SUNDIALS libraries under Windows, use
 *      #define SUNDIALS_EXPORT __declspec(dllexport)
 * When linking to shared SUNDIALS libraries under Windows, use
 *      #define SUNDIALS_EXPORT __declspec(dllimport)
 * In all other cases (other platforms or static libraries under
 * Windows), the SUNDIALS_EXPORT macro is empty
 */
#define SUNDIALS_EXPORT