<p>Well, it seems you're pointing me to the right direction. I tried disabling the Armadillo wrapper and linking BLAS and LAPACK:<br>
g++ main.cpp -O2 -std=gnu++11 -I/home/usrname/lib/Boost161/include -L/home/usrname/lib/Boost161/lib -lmlpack -I/home/usrname/lib/mlpacklib/include -L/home/usrname/lib/mlpacklib/lib -I /usr/include/armadillo_bits -DARMA_DONT_USE_WRAPPER -lblas -llapack</p>
<p>No problems so far! Thanks. </p>
<p>ldd a.out now:<br>
linux-vdso.so.1 => (0x00007ffecb793000)<br>
libmlpack.so.2 => /home/malfaras/lib/mlpacklib/lib/libmlpack.so.2 (0x00007fc841622000)<br>
libblas.so.3 => /usr/lib/libblas.so.3 (0x00007fc841374000)<br>
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fc840ff2000)<br>
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fc840ddc000)<br>
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fc840a12000)<br>
libarmadillo.so.7 => /usr/lib64/libarmadillo.so.7 (0x00007fc84080a000)<br>
libboost_program_options.so.1.61.0 => /home/malfaras/lib/Boost161/lib/libboost_program_options.so.1.61.0 (0x00007fc84058a000)<br>
libboost_serialization.so.1.61.0 => /home/malfaras/lib/Boost161/lib/libboost_serialization.so.1.61.0 (0x00007fc840347000)<br>
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fc84003e000)<br>
libgomp.so.1 => /usr/lib/x86_64-linux-gnu/libgomp.so.1 (0x00007fc83fe1c000)<br>
/lib64/ld-linux-x86-64.so.2 (0x0000562500129000)<br>
libopenblas.so.0 => /usr/lib/libopenblas.so.0 (0x00007fc83dd87000)<br>
libmkl_rt.so => /opt/intel/composer_xe_2015.1.133/mkl/lib/intel64/libmkl_rt.so (0x00007fc83d81f000)<br>
libarpack.so.2 => /usr/lib/libarpack.so.2 (0x00007fc83d5d4000)<br>
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fc83d3b6000)<br>
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fc83d1b2000)<br>
libgfortran.so.3 => /usr/lib/x86_64-linux-gnu/libgfortran.so.3 (0x00007fc83ce86000)<br>
liblapack.so.3 => /usr/lib/liblapack.so.3 (0x00007fc83c6a3000)<br>
libquadmath.so.0 => /usr/lib/x86_64-linux-gnu/libquadmath.so.0 (0x00007fc83c463000)</p>
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