This limitation applies to version 7.2.1 of the Intel® Math Kernel Library. A dependency on the symbol _MKL_BLAS_dlnu has been left in libmkl_ipf.a, but the symbol is not defined in the library. This function will never be called from MKL, but the linker will require it to be satisfied. As a work-around an empty definition of this function may be compiled and linked to satisfy the linker.