title: Cmake : CMAKE_MAKE_PROGRAM is not set
body: <p>I'm trying to build openCv, I never builded anything before.</p>
  
  <p>I installed gcc in C:\MinGW with <a href="ftp://ftp.equation.com/gcc/gcc-7.1.0-64.exe" rel="nofollow noreferrer">ftp://ftp.equation.com/gcc/gcc-7.1.0-64.exe</a>
  now when I type 'gcc --version' in the command line, I get an awnser.</p>
  
  <p>I then installed CMAKE from <a href="https://cmake.org/" rel="nofollow noreferrer">https://cmake.org/</a></p>
  
  <p>I run the GUI and selected my source folder then hit 'configure' that when the error happens.</p>
  
  <p>From my research I should have 'mingw64-make' in my path, it is not because when typing it in the command line produce "not recognized"</p>
  
  <p>I search my drives with UltraSearch and it just returned this :</p>
  
  <pre><code>﻿Name   Path    Size    Last Change File Type
  x86_64-w64-mingw32-c++.exe  C:\MinGW\bin\   1,10 MB 11/10/2017  .exe (Application)
  x86_64-w64-mingw32-g++.exe  C:\MinGW\bin\   1,10 MB 11/10/2017  .exe (Application)
  x86_64-w64-mingw32-gcc-7.1.0.exe    C:\MinGW\bin\   1,10 MB 11/10/2017  .exe (Application)
  x86_64-w64-mingw32-gcc-ar.exe   C:\MinGW\bin\   75,00 KB    11/10/2017  .exe (Application)
  x86_64-w64-mingw32-gcc-nm.exe   C:\MinGW\bin\   74,50 KB    11/10/2017  .exe (Application)
  x86_64-w64-mingw32-gcc-ranlib.exe   C:\MinGW\bin\   74,50 KB    11/10/2017  .exe (Application)
  x86_64-w64-mingw32-gcc.exe  C:\MinGW\bin\   1,10 MB 11/10/2017  .exe (Application)
  x86_64-w64-mingw32-gfortran.exe C:\MinGW\bin\   1,10 MB 11/10/2017  .exe (Application)
  </code></pre>
  
  <p>So it look like this mingw64-make is not present in the latest gcc release, what should I do?</p>
  
  <p>Thanks.</p>