MKL interval_arithmic module usage

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MKL interval_arithmic module usage

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I'm using interval_arithmetic as in

program main

use interval_arithmetic

implicit none

type
(D_INTERVAL) :: A, sumA

!Initialization stuff here

sumA = dinterval(zero, zero)

doj = 1, lda

do i = 1, lda

sumA = sumA + ABS(A(i,j))

enddo

Why is ABS, which is interfaced in the interval_arithmetic module, not recognized as such? The linker issues:

error LNK2019: unresolved external symbol _DI_ABS referenced in function _MAIN__

Thanks,

Gerry

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