https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755872#M11359 I expect the original poster was running 32-bit linux, and so switching to ia64 mkl wouldn't help. He didn't show whether the mkl library directory was on his library search path. Normally, mkl expects basic knowledge about such things, as it doesn't set itself up automatically. Fri, 27 Jun 2003 20:00:02 GMT TimP 2003-06-27T20:00:02Z https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755870#M11357 This message has been moved to the <A href="http://www.intel.com/IDS/forums/MKL">Intel Math Kernel Library forum</A> which launched on Dec. 18, 2003. Fri, 27 Jun 2003 01:03:32 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755870#M11357 newguy 2003-06-27T01:03:32Z https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755871#M11358 I did "nm" on all mkl libs and found that defn is present only in libmkl_lapack64.so.<BR />Please try linking this lib with your application.<BR /><BR />CP<BR /> Fri, 27 Jun 2003 12:12:58 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755871#M11358 cp_jain 2003-06-27T12:12:58Z https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755872#M11359 I expect the original poster was running 32-bit linux, and so switching to ia64 mkl wouldn't help. He didn't show whether the mkl library directory was on his library search path. Normally, mkl expects basic knowledge about such things, as it doesn't set itself up automatically. Fri, 27 Jun 2003 20:00:02 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755872#M11359 TimP 2003-06-27T20:00:02Z https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755873#M11360 Thanks I got it. I did have the proper directories in the search path. I removed all the libraies i had linked to before and just put in "-lmkl_lapack" &amp; "-lmkl_ia32". Fri, 27 Jun 2003 21:37:10 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/MKL-functions/m-p/755873#M11360 newguy 2003-06-27T21:37:10Z