I am using Qt Creator for development. I want to use Armadillo linear algebra library. Therefore I used following code in my pro file:
Qt Code: 
  1. INCLUDEPATH += C:\armadillo-7.950.1\include
  2.  
  3. LIBS += \
  4.     -LC:\armadillo-7.950.1\examples\lib_win64 \
  5.     -llapack_win64_MT \
  6.     -lblas_win64_MT
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It was all good and the project compiled and linked properly. Next task was to replace LAPACK and BLAS with OpenBLAS. So the pro file was changed as following:
Qt Code: 
  1. INCLUDEPATH += C:\armadillo-7.950.1\include \
  2.            C:\OpenBLAS-v0.2.19-Win64-int32\include
  3.  
  4. LIBS += \
  5.     -LC:\OpenBLAS-v0.2.19-Win64-int32\lib \
  6.     -llibopenblas
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Now I receive the error: LNK1104: cannot open file 'libopenblas.lib'. I have downloaded windows binary of OpenBLAS. The installed folder structure is as given in the image:
OpenBlas_Installation.JPG

Please let me know what is going wrong?

Thanks.