undefined reference to symbol 'cblas_sscal'?

[xtttttttttx]

I've successfully built dlib on Ubuntu16.04 which made me very happy. But when I compile an example face_landmarks_detection_ex.cpp with dlib, it complained as follows:

>> g++ -std=c++11 fld.cpp -o fld `pkg-config --cflags --libs dlib-1`         
/usr/bin/ld: /tmp/cc6IpsiA.o: undefined reference to symbol 'cblas_sscal'
//usr/lib/libcblas.so.3: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

I've googled it for a long time. But there's no solution for this.

[davisking]

Something is wrong with your blas library. Install openblas or some other blas that isn't missing symbols.

[emavgl]

Same problem here, openblas did not solve.

[davisking]

You guys should use cmake. Follow the instructions here: http://dlib.net/compile.html

[emavgl]

cmake works fine, but the problem occurs when linking dlib to another project.
However, I solved installing OpenBLAS (compiling and linking it) as you suggested and using this guide. Seems that the problem was a non-updated package.

[PapaMadeleine2022]

Same problem

[arju1996]

same issue still persists