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+      LOGICAL FUNCTION LSAME(CA,CB)
+*
+*  -- LAPACK auxiliary routine (version 3.1) --
+*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
+*     November 2006
+*
+*     .. Scalar Arguments ..
+      CHARACTER CA,CB
+*     ..
+*
+*  Purpose
+*  =======
+*
+*  LSAME returns .TRUE. if CA is the same letter as CB regardless of
+*  case.
+*
+*  Arguments
+*  =========
+*
+*  CA      (input) CHARACTER*1
+*
+*  CB      (input) CHARACTER*1
+*          CA and CB specify the single characters to be compared.
+*
+* =====================================================================
+*
+*     .. Intrinsic Functions ..
+      INTRINSIC ICHAR
+*     ..
+*     .. Local Scalars ..
+      INTEGER INTA,INTB,ZCODE
+*     ..
+*
+*     Test if the characters are equal
+*
+      LSAME = CA .EQ. CB
+      IF (LSAME) RETURN
+*
+*     Now test for equivalence if both characters are alphabetic.
+*
+      ZCODE = ICHAR('Z')
+*
+*     Use 'Z' rather than 'A' so that ASCII can be detected on Prime
+*     machines, on which ICHAR returns a value with bit 8 set.
+*     ICHAR('A') on Prime machines returns 193 which is the same as
+*     ICHAR('A') on an EBCDIC machine.
+*
+      INTA = ICHAR(CA)
+      INTB = ICHAR(CB)
+*
+      IF (ZCODE.EQ.90 .OR. ZCODE.EQ.122) THEN
+*
+*        ASCII is assumed - ZCODE is the ASCII code of either lower or
+*        upper case 'Z'.
+*
+          IF (INTA.GE.97 .AND. INTA.LE.122) INTA = INTA - 32
+          IF (INTB.GE.97 .AND. INTB.LE.122) INTB = INTB - 32
+*
+      ELSE IF (ZCODE.EQ.233 .OR. ZCODE.EQ.169) THEN
+*
+*        EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
+*        upper case 'Z'.
+*
+          IF (INTA.GE.129 .AND. INTA.LE.137 .OR.
+     +        INTA.GE.145 .AND. INTA.LE.153 .OR.
+     +        INTA.GE.162 .AND. INTA.LE.169) INTA = INTA + 64
+          IF (INTB.GE.129 .AND. INTB.LE.137 .OR.
+     +        INTB.GE.145 .AND. INTB.LE.153 .OR.
+     +        INTB.GE.162 .AND. INTB.LE.169) INTB = INTB + 64
+*
+      ELSE IF (ZCODE.EQ.218 .OR. ZCODE.EQ.250) THEN
+*
+*        ASCII is assumed, on Prime machines - ZCODE is the ASCII code
+*        plus 128 of either lower or upper case 'Z'.
+*
+          IF (INTA.GE.225 .AND. INTA.LE.250) INTA = INTA - 32
+          IF (INTB.GE.225 .AND. INTB.LE.250) INTB = INTB - 32
+      END IF
+      LSAME = INTA .EQ. INTB
+*
+*     RETURN
+*
+*     End of LSAME
+*
+      END