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    <p>Some possible causes:</p>
    a) Installation is corrupt [
<a class="moz-txt-link-freetext" href="https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/748744">https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/748744</a>
    ]<br>
         - You might want to check your Intel installation and see if
    the libifcore.so.5 file exists [
<a class="moz-txt-link-freetext" href="http://ladon.iqfr.csic.es/intel/doc/main_for/mergedProjects/bldaps_for/files_32.htm">http://ladon.iqfr.csic.es/intel/doc/main_for/mergedProjects/bldaps_for/files_32.htm</a>
    ]<br>
    <p>Are you compiling with Intel MPI (mpiifort), OpenMPI (mpifort [
      <a class="moz-txt-link-freetext" href="https://www.open-mpi.org/faq/?category=mpi-apps">https://www.open-mpi.org/faq/?category=mpi-apps</a> ]), or
      MVAPICH2/MPICH (mpif90 [
<a class="moz-txt-link-freetext" href="http://mvapich.cse.ohio-state.edu/static/media/mvapich/mvapich2-2.0-userguide.html#x1-220005.1">http://mvapich.cse.ohio-state.edu/static/media/mvapich/mvapich2-2.0-userguide.html#x1-220005.1</a>
      ,
      <a class="moz-txt-link-freetext" href="https://www.mpich.org/static/downloads/3.2.1/mpich-3.2.1-userguide.pdf">https://www.mpich.org/static/downloads/3.2.1/mpich-3.2.1-userguide.pdf</a>
      ("4 Compiling and Linking" on page 3) ])?</p>
    <p>What WIEN2k compiler settings did you use?<br>
    </p>
    <p>b) It could be due to a problem with the mpi installation and
      reinstalled might fix it such as was reported for MPICH [
<a class="moz-txt-link-freetext" href="https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/593731">https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/593731</a>
      ]</p>
    <p>c) It might be caused by the mpi program being built with the
      wrong compiler (e.g., gfortran instead of ifort) or wrong compiler
      version (e.g., ifort 2015 instead of 2018) as was mentioned for
      OpenMPI [
<a class="moz-txt-link-freetext" href="https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/590325">https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/590325</a>
      ]</p>
    <p>d) Since it looks like -lifcore (libifcore.so.5) is needed to
      provide the for_ifcore_version function, it may be that you need
      to add "-lifcore" to your compiler settings [
      <a class="moz-txt-link-freetext" href="https://www.psc.edu/phase2-earlyuser-info?id=2192">https://www.psc.edu/phase2-earlyuser-info?id=2192</a> (refer to
      MVAPICH2 for Fortran in the Table under the "Compile with this
      command" column) ].<br>
    </p>
    <div class="moz-cite-prefix">On 2/3/2018 3:11 AM, Nacir GUECHI
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:1333896362.3520108.1517652705675@mail.yahoo.com">
      <div style="font-family:times new roman, new york, times,
        serif;font-size:16px;">
        <div>
          <div>Dear WIEN2k users,</div>
          <div class="">
            <div>I wanted to compile Wien2k with 
              "parallel_studio_xe_2018_update1_cluster_edition" but I
              get the error:</div>
            <div>/opt/intel_18/compilers_and_libraries_2018.1.148/linux/compiler/lib/intel64/libifport.so.5:
              undefined reference to `for_ifcore_version'.</div>
            <div class="">The environment variables are set in .bashrc
              as:</div>
            <div>source
/opt/intel_18/compilers_and_libraries_2018.1.148/linux/mpi/bin64/mpivars.sh<br>
              <div>source
/opt/intel_18/compilers_and_libraries_2018.1.148/linux/bin/compilervars.sh
                -arch intel64 -platform linux</div>
              <div>What did I do wrong?<br>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
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