I'm trying to build the latest version of OpenCV with CUDA and [extra modules](https://github.com/opencv/opencv_contrib) using CMake. I want CMake to generate a solution for Visual Studio 2017 Community RC so I'm calling CMake with -G "Visual Studio 15 2017". CMake fails in the configuration step, though, giving me the following output in CMakeError.log:
Build started 12/31/2016 5:46:35 PM.
Project "C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\cmTC_aa5bd.vcxproj" on node 1 (default targets).
PrepareForBuild:
Creating directory "cmTC_aa5bd.dir\Debug\".
Creating directory "C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\Debug\".
Creating directory "cmTC_aa5bd.dir\Debug\cmTC_aa5bd.tlog\".
InitializeBuildStatus:
Creating "cmTC_aa5bd.dir\Debug\cmTC_aa5bd.tlog\unsuccessfulbuild" because "AlwaysCreate" was specified.
ClCompile:
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.10.24728\bin\HostX86\x64\CL.exe /c /Zi /W3 /WX- /diagnostics:classic /MP4 /Od /Ob0 /Oi /D WIN32 /D _WINDOWS /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /D _DEBUG /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /Gy /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"cmTC_aa5bd.dir\Debug\\" /Fd"cmTC_aa5bd.dir\Debug\vc141.pdb" /Gd /TC /errorReport:queue /bigobj "C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\CheckIncludeFile.c"
Microsoft (R) C/C++ Optimizing Compiler Version 19.10.24728 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
cl /c /Zi /W3 /WX- /diagnostics:classic /MP4 /Od /Ob0 /Oi /D WIN32 /D _WINDOWS /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /D _DEBUG /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /Gy /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"cmTC_aa5bd.dir\Debug\\" /Fd"cmTC_aa5bd.dir\Debug\vc141.pdb" /Gd /TC /errorReport:queue /bigobj "C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\CheckIncludeFile.c"
CheckIncludeFile.c
C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\CheckIncludeFile.c(1): fatal error C1083: Cannot open include file: 'unistd.h': No such file or directory [C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\cmTC_aa5bd.vcxproj]
Done Building Project "C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\cmTC_aa5bd.vcxproj" (default targets) -- FAILED.
Build FAILED.
"C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\cmTC_aa5bd.vcxproj" (default target) (1) ->
(ClCompile target) ->
C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\CheckIncludeFile.c(1): fatal error C1083: Cannot open include file: 'unistd.h': No such file or directory [C:\Libs\Temp\opencv-3.2\CMakeFiles\CMakeTmp\cmTC_aa5bd.vcxproj]
0 Warning(s)
1 Error(s)
Time Elapsed 00:00:00.57
It seems it is looking for unistd.h, not finding it since it is a Unix library.
I have found a similar question [here](http://answers.opencv.org/question/60156/error-building-opencv-300-beta-on-windows/#), but it is a bit old and unanswered. Am I missing something or is it a bug in the source code as suggested in the previously asked question?
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