Hi Aleks, just to give a feedback to all. 1/ mpixlf77_r instead of mpixlf77 works successfully. 2/ Including the lib (in this case IBM ESSL Library) works via makenek is also O.K. In my case (BG/Q): # linking flags USR_LFLAGS="-L/bgsys/local/lib -lesslbg" Thanks once more, Joerg. Hi Joerg, Could you try thread-safe compilers, mpixlf77_r mpicc_r before I start asking around? Thanks. Aleks ________________________________ From: [email protected]<mailto:[email protected]> [[email protected]<mailto:[email protected]>] on behalf of [email protected]<mailto:[email protected]> [[email protected]<mailto:[email protected]>] Sent: Wednesday, September 03, 2014 1:51 PM To: [email protected]<mailto:[email protected]> Subject: [Nek5000-users] Linking ESSL Lib to nek5000 Hi Aleks, I followed your suggestion and changed the path in makenek to # linking flags USR_LFLAGS="-L/bgsys/local/lib -lesslbg" This where ESSL lib is found on BG/Q Juqueen in Juelich. When I run makenek, I get the following error message. mpixlf77 -qsuppress=cmpmsg -o nek5000 obj/G1_96.o obj/drive.o obj/drive1.o obj/drive2.o obj/plan4.o obj/bdry.o obj/coef.o obj/conduct.o obj/connect1.o obj/connect2.o obj/dssum.o obj/edgec.o obj/eigsolv.o obj/gauss.o obj/genxyz.o obj/navier1.o obj/makeq.o obj/navier0.o obj/navier2.o obj/navier3.o obj/navier4.o obj/prepost.o obj/speclib.o obj/map2.o obj/turb.o obj/mvmesh.o obj/ic.o obj/ssolv.o obj/planx.o obj/math.o obj/mxm_wrapper.o obj/hmholtz.o obj/gfdm_par.o obj/gfdm_op.o obj/gfdm_solve.o obj/subs1.o obj/subs2.o obj/genbox.o obj/gmres.o obj/hsmg.o obj/convect.o obj/induct.o obj/perturb.o obj/navier5.o obj/navier6.o obj/navier7.o obj/navier8.o obj/fast3d.o obj/fasts.o obj/calcz.o obj/byte.o obj/chelpers.o obj/byte_mpi.o obj/postpro.o obj/cvode_driver.o obj/nek_comm.o obj/init_plugin.o obj/setprop.o obj/qthermal.o obj/cvode_aux.o obj/makeq_aux.o obj/papi.o obj/nek_in_situ.o obj/mxm_std.o obj/blas.o obj/comm_mpi.o obj/singlmesh.o obj/dsygv.o obj/ssygv.o obj/jl_gs.o obj/jl_sort.o obj/jl_sarray_transfer.o obj/jl_sarray_sort.o obj/jl_gs_local.o obj/jl_crystal.o obj/jl_comm.o obj/jl_tensor.o obj/jl_fail.o obj/jl_fcrystal.o obj/jl_findpts.o obj/jl_findpts_local.o obj/jl_obbox.o obj/jl_poly.o obj/jl_lob_bnd.o obj/jl_findpts_el_3.o obj/jl_findpts_el_2.o obj/jl_amg.o obj/jl_fcrs.o -L/bgsys/local/lib -lesslbg /bgsys/local/lib/libesslbg.a(emon.o):(.text+0x150): undefined reference to `_xlf_create_threadlocal' make: *** [nek5000] Error 1 Do you know what went wrong? Thanks, Joerg. _______________________________________________ Nek5000-users mailing list [email protected]<mailto:[email protected]> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users