Linking problem

I have a piece of code to call the C function GetAdaptersInfo to obtain the MAC address(es) of the computer.

The (abridged) code that works is

USE IFWINTY

! define Fortran equivalents of required C structures

INTERFACE
  INTEGER (BOOL) FUNCTION GetAdaptersInfo(arg1, arg2)   !                       &
 !&                                              BIND(C, NAME='GetAdaptersInfo')
!DEC$ ATTRIBUTES DEFAULT, STDCALL, DECORATE, ALIAS:'GetAdaptersInfo' :: GetAdaptersInfo
  USE IFWINTY
  INTEGER (LPLONG) :: arg1
  INTEGER (LPLONG) :: arg2
  END FUNCTION GetAdaptersInfo
END INTERFACE

dwRetVal = SIZEOF(AdapterInfo)

iret = GetAdaptersInfo(LOC(AdapterInfo), LOC(dwRetVal))

However, I would prefer to do it the ISO standard way instead of using specific compiler directives so if I have tried changing the code to

USE IFWINTY
USE ISO_C_BINDING

INTERFACE
  INTEGER (BOOL) FUNCTION GetAdaptersInfo(arg1, arg2)                          &
  &                                              BIND(C, NAME='GetAdaptersInfo')
  USE IFWINTY
  USE ISO_C_BINDING
  INTEGER (LPLONG) :: arg1
  INTEGER (LPLONG) :: arg2
  END FUNCTION GetAdaptersInfo
END INTERFACE

but then it fails in the linker step cannot resolve _GetAdaptersInfo

What am I doing wrong.

TIA

Clive