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/usr/lib/petscdir/3.7.5/x86_64-linux-gnu-complex-debug/include/petscviewersaws.h is in libpetsc-complex-3.7.5-dbg 3.7.5+dfsg1-4+b1.

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#if !defined(__PETSCVIEWERSAWS_H)
#define __PETSCVIEWERSAWS_H

#include <petscviewer.h>
#include <SAWs.h>
PETSC_EXTERN PetscErrorCode PetscViewerSAWsOpen(MPI_Comm,PetscViewer*);
PETSC_EXTERN PetscViewer    PETSC_VIEWER_SAWS_(MPI_Comm);
PETSC_EXTERN PetscErrorCode PETSC_VIEWER_SAWS_Destroy(MPI_Comm);
#define PETSC_VIEWER_SAWS_WORLD PETSC_VIEWER_SAWS_(PETSC_COMM_WORLD)
#define PETSC_VIEWER_SAWS_SELF  PETSC_VIEWER_SAWS_(PETSC_COMM_SELF)

#define PetscStackCallSAWs(func,args) do {PetscErrorCode _ierr; \
    PetscStackPush(#func);_ierr = func args;PetscStackPop; if (_ierr) {SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_LIB,"Error in %s() %d",#func,_ierr);} \
} while (0)

#endif