flexible GMRES from ITSOL developed by Yousef Saad.  
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| double | ddot_ (int *, double[], int *, double[], int *) | 
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| double | dnrm2_ (int *, double[], int *) | 
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| int | dfgmr (int n, void(*dmatvec)(double, double[], double, double[]), void(*dpsolve)(int, double[], double[]), double *rhs, double *sol, double tol, int im, int *itmax, FILE *fits) | 
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          | double ddot_ | ( | int * | , | 
        
          |  |  | double | [], | 
        
          |  |  | int * | , | 
        
          |  |  | double | [], | 
        
          |  |  | int * |  | 
        
          |  | ) |  |  | 
      
 
 
      
        
          | int dfgmr | ( | int | n, | 
        
          |  |  | void(*)(double, double[], double, double[]) | dmatvec, | 
        
          |  |  | void(*)(int, double[], double[]) | dpsolve, | 
        
          |  |  | double * | rhs, | 
        
          |  |  | double * | sol, | 
        
          |  |  | double | tol, | 
        
          |  |  | int | im, | 
        
          |  |  | int * | itmax, | 
        
          |  |  | FILE * | fits | 
        
          |  | ) |  |  | 
      
 
 
      
        
          | double dnrm2_ | ( | int * | , | 
        
          |  |  | double | [], | 
        
          |  |  | int * |  | 
        
          |  | ) |  |  |