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+ SUBROUTINE XERBLA( SRNAME, INFO )
+*
+* -- LAPACK auxiliary routine (version 3.1) --
+* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
+* November 2006
+*
+* .. Scalar Arguments ..
+ CHARACTER*6 SRNAME
+ INTEGER INFO
+* ..
+*
+* Purpose
+* =======
+*
+* XERBLA is an error handler for the LAPACK routines.
+* It is called by an LAPACK routine if an input parameter has an
+* invalid value. A message is printed and execution stops.
+*
+* Installers may consider modifying the STOP statement in order to
+* call system-specific exception-handling facilities.
+*
+* Arguments
+* =========
+*
+* SRNAME (input) CHARACTER*6
+* The name of the routine which called XERBLA.
+*
+* INFO (input) INTEGER
+* The position of the invalid parameter in the parameter list
+* of the calling routine.
+*
+* =====================================================================
+*
+* .. Executable Statements ..
+*
+ WRITE( *, FMT = 9999 )SRNAME, INFO
+*
+ STOP
+*
+ 9999 FORMAT( ' ** On entry to ', A6, ' parameter number ', I2, ' had ',
+ $ 'an illegal value' )
+*
+* End of XERBLA
+*
+ END