++ -fPIC -m64 -Wall -g -O3  -msse4 -mpopcnt -fopenmp -Wno-sign-compare -Dnullptr=NULL -Doverride= -fopenmp -c AutoTune.cpp -o AutoTune.o  
g++ -fPIC -m64 -Wall -g -O3  -msse4 -mpopcnt -fopenmp -Wno-sign-compare -Dnullptr=NULL -Doverride= -fopenmp -c AuxIndexStructures.cpp -o AuxIndexStructures.o  
ar r libfaiss.a hamming.o utils.o IndexFlat.o IndexIVF.o IndexLSH.o IndexPQ.o IndexIVFPQ.o Clustering.o Heap.o VectorTransform.o index_io.o PolysemousTraining.o MetaIndexes.o Index.o ProductQuantizer.o AutoTune.o AuxIndexStructures.o
ar: creating libfaiss.a
g++ -o tests/demo_ivfpq_indexing -fPIC -m64 -Wall -g -O3  -msse4 -mpopcnt -fopenmp -Wno-sign-compare -Dnullptr=NULL -Doverride= -fopenmp tests/demo_ivfpq_indexing.cpp libfaiss.a -g -fPIC  -fopenmp /usr/lib/libopenblas.so.0
libfaiss.a(utils.o): In function `faiss::matrix_qr(int, int, float*)':
/root/DVA/faiss/utils.cpp:1215: undefined reference to `sgeqrf_'
/root/DVA/faiss/utils.cpp:1220: undefined reference to `sgeqrf_'
/root/DVA/faiss/utils.cpp:1223: undefined reference to `sorgqr_'
libfaiss.a(VectorTransform.o): In function `faiss::OPQMatrix::train(long, float const*)':
/root/DVA/faiss/VectorTransform.cpp:603: undefined reference to `sgesvd_'
/root/DVA/faiss/VectorTransform.cpp:594: undefined reference to `sgesvd_'
libfaiss.a(VectorTransform.o): In function `faiss::PCAMatrix::train(long, float const*)':
/root/DVA/faiss/VectorTransform.cpp:284: undefined reference to `ssyev_'
/root/DVA/faiss/VectorTransform.cpp:289: undefined reference to `ssyev_'
collect2: error: ld returned 1 exit status
make: *** [tests/demo_ivfpq_indexing] Error 1