As the Oslandia team work exclusively on GNU/Linux, the exercise of compiling QGIS 3 on Windows 8 is not an everyday’s task :). So we decided to share our experience, we bet that will help some of you.
Cygwin
The first step is to download Cygwin and to install it in the directory C:\cygwin (instead of the default C:\cygwin64). During the installation, select the lynx package:
Once installed, you have to click on the Cygwin64 Terminal icon newly created on your desktop:
Then, we’re able to install dependencies and download some other installers:
[pastacode lang=”bash” manual=”%24%20cd%20%2Fcygdrive%2Fc%2FUsers%2Fhenri%2FDownloads%0A%24%20lynx%20-source%20rawgit.com%2Ftranscode-open%2Fapt-cyg%2Fmaster%2Fapt-cyg%20%3E%20apt-cyg%0A%24%20install%20apt-cyg%20%2Fbin%0A%24%20apt-cyg%20install%20wget%20git%20flex%20bison%0A%24%20wget%20http%3A%2F%2Fdownload.microsoft.com%2Fdownload%2FD%2F2%2F3%2FD23F4D0F-BA2D-4600-8725-6CCECEA05196%2Fvs_community_ENU.exe%0A%24%20chmod%20u%2Bx%20vs_community_ENU.exe%0A%24%20wget%20https%3A%2F%2Fcmake.org%2Ffiles%2Fv3.7%2Fcmake-3.7.2-win64-x64.msi%0A%24%20wget%20http%3A%2F%2Fdownload.osgeo.org%2Fosgeo4w%2Fosgeo4w-setup-x86_64.exe%0A%24%20chmod%20u%2Bx%20osgeo4w-setup-x86_64.exe” message=”” highlight=”” provider=”manual”/]
CMake
The next step is to install CMake. To do that, double clic on the file cmake-3.7.2-win64-x64.msi previously downloaded with wget. You should choose the next options during the installation:
Visual Studio
Then, we have to install Visual Studio and C++ tools. Double click on the vs_community_ENU.exe file and select the Custom installation. On the next page, you have to select Visual C++ chekbox:
OSGeo4W
In order to compile QGIS, some dependencies provided by the OSGeo4W installer are required. Double click on osgeo4w-setup-x86_64.exe and select the Advanced Install mode. Then, select the next packages:
- expat
- fcgi
- gdal
- grass
- gsl-devel
- iconv
- libzip-devel
- libspatialindex-devel
- pyqt5
- python3-devel
- python3-qscintilla
- python3-nose2
- python3-future
- python3-pyyaml
- python3-mock
- python3-six
- qca-qt5-devel
- qca-qt5-libs
- qscintilla-qt5
- qt5-devel
- qt5-libs-debug
- qtwebkit-qt5-devel
- qtwebkit-qt5-libs-debug
- qwt-devel-qt5
- sip-qt5
- spatialite
- oci
- qtkeychain
QGIS
To start this last step, we have to create a file C:\OSGeo4W\OSGeo4W-dev.bat containing something like:
[pastacode lang=”bash” manual=”%40echo%20off%20%0Aset%20OSGEO4W_ROOT%3DC%3A%5COSGeo4W64%0Acall%20%22%25OSGEO4W_ROOT%25%5Cbin%5Co4w_env.bat%22%20%0Acall%20%22%25OSGEO4W_ROOT%25%5Cbin%5Cqt5_env.bat%22%20%0Acall%20%22%25OSGEO4W_ROOT%25%5Cbin%5Cpy3_env.bat%22%20%0Aset%20VS140COMNTOOLS%3D%25PROGRAMFILES(x86)%25%5CMicrosoft%20Visual%20Studio%2014.0%5CCommon7%5CTools%5C%20%0Acall%20%22%25PROGRAMFILES(x86)%25%5CMicrosoft%20Visual%20Studio%2014.0%5CVC%5Cvcvarsall.bat%22%20amd64%20%0Aset%20INCLUDE%3D%25INCLUDE%25%3B%25PROGRAMFILES(x86)%25%5CMicrosoft%20SDKs%5CWindows%5Cv7.1A%5Cinclude%20%0Aset%20LIB%3D%25LIB%25%3B%25PROGRAMFILES(x86)%25%5CMicrosoft%20SDKs%5CWindows%5Cv7.1A%5Clib%20%0Apath%20%25PATH%25%3B%25PROGRAMFILES%25%5CCMake%5Cbin%3Bc%3A%5Ccygwin%5Cbin%20%0A%40set%20GRASS_PREFIX%3D%22%25OSGEO4W_ROOT%25%5Capps%5Cgrass%5Cgrass-7.2.1%20%0A%40set%20INCLUDE%3D%25INCLUDE%25%3B%25OSGEO4W_ROOT%25%5Cinclude%20%0A%40set%20LIB%3D%25LIB%25%3B%25OSGEO4W_ROOT%25%5Clib%3B%25OSGEO4W_ROOT%25%5Clib%20%0A%0A%40cmd%20″ message=”” highlight=”” provider=”manual”/]
According to your environment, some variables should probably be adapted. Then in the Cygwin terminal:
[pastacode lang=”bash” manual=”%24%20cd%20C%3A%5C%0A%24%20git%20clone%20git%3A%2F%2Fgithub.com%2Fqgis%2FQGIS.git%0A%24%20.%2FOSGeo4W-dev.bat%0A%3E%20cd%20QGIS%2Fms-windows%2Fosgeo4w” message=”” highlight=”” provider=”manual”/]
In this directory, you have to edit the file package-nightly.cmd to replace:
[pastacode lang=”bash” manual=”cmake%20-G%20Ninja%20%5E” message=”” highlight=”” provider=”manual”/]
by:
[pastacode lang=”bash” manual=”cmake%20-G%20%22Visual%20Studio%2014%202015%20Win64%22%20%5E” message=”” highlight=”” provider=”manual”/]
Moreover, we had to update the environment variable SETUAPI_LIBRARY according to the current position of the Windows Kits file SetupAPI.Lib:
[pastacode lang=”bash” manual=”set%20SETUPAPI_LIBRARY%3DC%3A%5CProgram%20Files%20(x86)%5CWindows%20Kits%5C8.1%5CLib%5Cwinv6.3%5Cum%5Cx64%5CSetupAPI.Lib” message=”” highlight=”” provider=”manual”/]
And finally, we just have to compile with the next command:
[pastacode lang=”markup” manual=”%3E%20package-nightly.cmd%202.99.0%201%20qgis-dev%20x86_64″ message=”” highlight=”” provider=”manual”/]
Victory!
And see you soon for the generation of OSGEO4W packages 
Source
https://github.com/qgis/QGIS/blob/ab859c9bdf8a529df9805ff54e7250921a74d877/doc/msvc.t2t
