Update.

win-build-qt-mingw.md

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+## Build Qt with MSYS2
+Using MSYS2 is much more easier, so I will only write about how to build Qt through MSYS2. If you want to build Qt through MSYS or MinGW(-w64), do it yourself.
+
+### Step 1: Prepare MSYS2
+1. Download MSYS2 from it's [official website](http://www.msys2.org/) (http://www.msys2.org/) and install it.
+2. Run MSYS2 shell command prompt (default location: "C:\msys64\msys2_shell.cmd" -msys)
+3. Update MSYS2 core components (if you have not done it yet):
+   ```text
+   pacman -Syu
+   ```
+4. Exit out from MSYS2-shell (just close the shell window forcely), restart MSYS2-shell, then run below command, to complete rest of other components update:
+   ```text
+   pacman -Su
+   ```
+5. Exit out of MSYS2-shell, restart MSYS2-shell, then you are ready to use MSYS2-shell.
+
+### Step 2: Install required components
+1. If you want to use ANGLE, download Microsoft DirectX SDK June 2010 from it's [official website](http://www.microsoft.com/en-us/download/details.aspx?id=6812) (http://www.microsoft.com/en-us/download/details.aspx?id=6812) and install it.
+2. Start MSYS2-shell. Run/execute below commands to load MinGW-w64 SEH (64bit/x86_64) posix and Dwarf-2 (32bit/i686) posix toolchains & related other tools, dependencies & components from MSYS2 REPO:
+   ```text
+   pacman -S base-devel git mercurial cvs wget p7zip
+   pacman -S perl ruby python2 mingw-w64-i686-toolchain mingw-w64-x86_64-toolchain
+   ```
+   **Note**
+
+   The i686 (32bit) toolchain loads into "/c/msys64/mingw32/bin" ("C:\msys64\mingw32\bin") directory location, and, x86_64 (64bit) toolchain loads into "/c/msys64/mingw64/bin" ("C:\msys64\mingw64\bin") directory. Perl, Ruby, Python, OpenSSL etc loads into "/c/msys64/usr/bin" ("C:\msys64\usr\bin") directory.
+
+### Step 3: Build Qt
+1. Start MSYS2 shell command prompt and run below commands:
+   ```text
+   cd /c/Qt/Qt5.11.0/src
+   windows2unix() { local pathPcs=() split pathTmp IFS=\;; read -ra split <<< "$*"; for pathTmp in "${split[@],}"; do pathPcs+=( "/${pathTmp//+([:\\])//}" ); done; echo "${pathPcs[*]}"; }; systemrootP=$(windows2unix "$SYSTEMROOT"); export PATH="/c/Program Files (x86)/Microsoft DirectX SDK (June 2010):$PWD/qtbase/bin:$PWD/gnuwin32/bin:/c/msys64/mingw64/bin:/c/msys64/usr/bin:$PATH"
+   ```
+   **Note**
+
+   "/c/Qt/Qt5.11.0/src" is the location of your Qt source code directory, "/" means "\\", "/c/" means "C:\\", "/d/" means "D:\\" and so on.
+2. Run below commands to configure Qt:
+   ```text
+   ./configure -opensource -confirm-license -release -static -static-runtime -skip qtwebengine -platform win32-g++ -opengl dynamic -nomake examples -nomake tests -prefix $PWD/../dist -c++std c++1z -silent -ltcg
+   ```
+   **Note**
+
+   1. If you want to build the debug version of Qt, use "-debug" instead of "-release" or if you want to build both debug and release versions of Qt, use "-debug-and-release" instead of "-release".
+   2. If you want to build the shared version of Qt, use "-shared" instead of "-static -static-runtime".
+   3. **If you want to build QWebEngine, you have to change your system locale to English(United States)** and don't forget to change it back after building Qt.
+   4. According to Qt official wiki, **QWebEngine module cannot be compiled statically**, so you have skip it using "-skip qtwebengine" when you are building the static version of Qt.
+   5. If you want Qt to load OpenGL dynamically, use "-opengl dynamic" (recommended, but need Microsoft DirectX SDK to build ANGLE), if you want Qt to use Desktop OpenGL only, use "-opengl desktop", if you want Qt to use ANGLE only, use "-opengl es2" (Windows only).
+   6. --prefix=The target directory the compiled binaries should be copied to.
+3. If the configuration process above finished successfully, run below commands to build Qt and copy the binaries to the target directory:
+   ```text
+   mingw32-make -j n && mingw32-make install
+   ```
+   **Note**
+
+   mingw32-make -j n where "n" are the number of CPU cores you have.