Building opencv 3.1 on windows - where do I specify the LAPACK library location?

问题

For building opencv 3.1 I'm using cmake with Visual Studio 2013. I downloaded the dependencies as shown here: http://docs.opencv.org/3.1.0/d3/d52/tutorial_windows_install.html
While configuring cmake, the first thing it shows is:

FP16: Compiler support is available
A library with BLAS API not found. Please specify library location.
LAPACK requires BLAS
A library with LAPACK API not found. Please specify library location.

The problem is, that I don't know how to specify the location. For the "Eigen" library I set the library path myself (EIGEN_INCLUDE_PATH, which is pre defined) and cmake says:

Other third-party libraries:
    Use IPP:                     NO
    Use IPP Async:               NO
    Use Lapack:                  NO
    Use Eigen:                   YES (ver 3.2.10)
    Use Cuda:                    NO
    Use OpenCL:                  YES
    Use OpenVX:                  NO
    Use custom HAL:              NO

but there is no pre defined variable for LAPACK. I also tried to put the *.lib and header files in a subdirectory, which I downloaded from http://icl.cs.utk.edu/lapack-for-windows/, in the hope if cmake somehow finding the library.

I have to build opencv 3.1 myself, because in the distributed version, the extra modules are disabled. It builds without LAPACK, but my guess is, that I will loose a lot of performance.

Thank you very much for your help!

回答1:

For me, I used OpenBlas library:

Use CMake Gui to config opencv

Select Advanced
In the OpenBLAS group, config the include folder and library file for OpenBLAS
In the WITH group, select WITH_LAPACK
Now click the Configure button, CMake will automatically config Lapack info.
After all is ok, you can click on Generate button on CMake Gui to generate visual studio project files and start to build.

回答2:

I would add a comment but I do not have enough rep for it. In my case to build OpenCV 3.2 in Visual Studio 2013 with OpenBlas and LAPACK, in addition to Viets' answer, I had to change two lines in lapacke.h to use the standard library based on here

So, for OpenBLAS version 0.2.19-Win64-int32 in lapacke.h I changed

@line 74 float _Complex to std::complex<float> and

@line 90 double _Complex to std::complex<double>

without the need to build the OpenBLAS library again.

Hope it helps.

来源：https://stackoverflow.com/questions/40134261/building-opencv-3-1-on-windows-where-do-i-specify-the-lapack-library-location

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