Please state the information for your system

• OpenCV version: from git, version eca7523
  with opencv-contrib modules from git, version ba1d3ef
• Host OS: Debian Stretch, Linux 4.5.0-2-amd64 Fixes #1 SMP Debian 4.5.3-2 (2016-05-08) x86_64 GNU/Linux
• gcc version 5.3.1 20160519 (Debian 5.3.1-20)
• cmake version 3.5.2

In which part of the OpenCV library you got the issue?

The issue arises when I want to use both vigra and OpenCV:

#include <opencv2/opencv.hpp>
#include <vigra/multi_array.hxx>

I made a minimal example project

Expected behaviour

Compile without errors / warnings.

Actual behaviour

Doesn't compile at all.

Additional description

I filed this against vigra first and I was told this is an OpenCV bug since OpenCV adds an abs function to the std:: namespace.

It works if I change the order of the include statements.

Code example to reproduce the issue / Steps to reproduce the issue

Please try to give a full example which will compile as is.

main.cpp:

#include <opencv2/opencv.hpp>
#include <vigra/multi_array.hxx>

int main()
{
    return 0;
}

CmakeLists.txt:

project(vigratest2)
cmake_minimum_required(VERSION 2.8)
add_executable(vigratest2 main.cpp)