[Nix-dev] How to build a Haskell binding to a C++ library (OpenCV) on OS X

[Laverne Schrock]

On Sun, 2017-06-18 at 21:47 +0200, Bas van Dijk wrote:
> Good evening,
> 
> I'm trying to build our Haskell binding to the OpenCV C++ library on
> OS X. The following commands should do the job:
> 
>   git clone https://github.com/LumiGuide/haskell-opencv.git
>   cd opencv
>   nix-build
> 
> Unfortunately it fails during the configure phase with:
> 
>   Setup: Cannot find the program 'gcc'.   User-specified path 'g++'
> does not refer  to an executable and the program is not on the system
> path.
> 
> If I add gcc to the build dependencies of opencv/opencv.nix using: 
> 
>   buildDepends = [ gcc ];
> 
> and invoke nix-build again I get a different error:
> 
>   Setup: Missing dependencies on foreign libraries:  * Missing C
> libraries: stdc++, opencv_stitching, opencv_superres, 
> opencv_videostab, opencv_aruco, opencv_bgsegm, opencv_bioinspired, 
> opencv_ccalib, opencv_dpm, opencv_freetype, opencv_fuzzy, 
> opencv_line_descriptor, opencv_optflow, opencv_reg, opencv_saliency, 
> opencv_stereo, opencv_structured_light, opencv_phase_unwrapping,
> opencv_rgbd,  opencv_surface_matching, opencv_tracking,
> opencv_datasets, opencv_text,  opencv_face, opencv_plot, opencv_dnn,
> opencv_xfeatures2d, opencv_shape,  opencv_video, opencv_ximgproc,
> opencv_calib3d, opencv_features2d,  opencv_flann, opencv_xobjdetect,
> opencv_objdetect, opencv_ml, opencv_xphoto,  opencv_highgui,
> opencv_videoio, opencv_imgcodecs, opencv_photo,  opencv_imgproc,
> opencv_core  This problem can usually be solved by installing the
> system packages that  provide these libraries (you may need the "-
> dev" versions). If the libraries  are already installed but in a non-
> standard location then you can use the  flags --extra-include-dirs=
> and --extra-lib-dirs= to specify where they are.
> 
> Any ideas how to get this working?
> 
> Regards,
> 
> Bas
> 

Have you tried adding opencv as a buildInput? Maybe something like:

`buildInputs = [ stdenv opencv3 ] ;`?

But I have no idea what `libraryPkgconfigDepends = [ opencv3 ];` is
supposed to be doing.
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