 &gt;= MAX(1,N).

  X       (input/output) COMPLEX*16 array, dimension (LDX,*)
          On entry, if JOBX = 'U', the leading N-by-N part of this
          array must contain a given matrix X, for instance the left
          transformation matrix VSL returned by the LAPACK Library
          routine ZGGES.
          On exit, if JOBX = 'U', the leading N-by-N part of this
          array contains the product of the given matrix X and the
          left transformation matrix that reduced (A,B) to block-
      