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/usr/lib/petscdir/3.4.2/include/petscviewerams.h is in libpetsc3.4.2-dev 3.4.2.dfsg1-6.

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#if !defined(__PETSCVIEWERAMS_H)
#define __PETSCVIEWERAMS_H

#include <petscviewer.h>
#include <ams.h>
PETSC_EXTERN PetscErrorCode PetscViewerAMSSetCommName(PetscViewer,const char[]);
PETSC_EXTERN PetscErrorCode PetscViewerAMSGetAMSComm(PetscViewer,AMS_Comm *);
PETSC_EXTERN PetscErrorCode PetscViewerAMSOpen(MPI_Comm,const char[],PetscViewer*);
PETSC_EXTERN PetscViewer    PETSC_VIEWER_AMS_(MPI_Comm);
PETSC_EXTERN PetscErrorCode PETSC_VIEWER_AMS_Destroy(MPI_Comm);
#define PETSC_VIEWER_AMS_WORLD PETSC_VIEWER_AMS_(PETSC_COMM_WORLD)
#define PETSC_VIEWER_AMS_SELF  PETSC_VIEWER_AMS_(PETSC_COMM_SELF)

#define PetscStackCallAMS(func,args) do {PetscErrorCode _ierr; char* err; \
    PetscStackPush(#func);_ierr = func args;PetscStackPop; if (_ierr) {AMS_Explain_error(_ierr,&err); SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_LIB,"Error in %s() %s",#func,err);} \
} while (0)

#endif