Qt for Windows - Building from Source | Qt 5.5

- Qt 5.5
- Qt for Windows - Building from Source
- Qt 5.5.1 Reference Documentation

# Qt for Windows - Building from Source

This page describes the process of configuring and building Qt for Windows. Before building, there are some requirements that are given in more detail in the Qt for Windows - Requirements document.

You can download the Qt 5 sources from the Downloads page. For more information, visit the Getting Started with Qt page.

## Step 1: Install the License File (Commercial Editions Only)

If you have the commercial edition of Qt, copy the license file from your account on the distribution server into your home directory (this may be known as the `userprofile` environment variable) and rename it to `.qt-license`. This renaming process must be done using a command prompt on Windows, not with Windows Explorer. For example on Windows 2000, `%USERPROFILE%` should be something like `C:\Documents and Settings\username`

For the open source version you do not need a license file.

## Step 2: Unpack the Archive

Uncompress the files into the directory you want Qt installed; e.g. `C:\Qt\5.5.1`.

Note: The install path must not contain any spaces or Windows specific file system characters.

## Step 3: Set the Environment Variables

We recommend creating a desktop link that opens a command prompt with the environment set up similar to the Command Prompt menu entries provided by the Windows SDKs. This is done by creating an application link passing a `.cmd` file setting up the environment and the command line option `/k` (remain open) to `cmd.exe`.

Assuming the file is called `qt5vars.cmd` and the Qt folder is called `qt-5` and located under `C:\qt`:

    REM Set up \Microsoft Visual Studio 2013, where <arch> is \c amd64, \c x86, etc.
    CALL "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" <arch>
    SET _ROOT=C:\qt\qt-5
    SET PATH=%_ROOT%\qtbase\bin;%_ROOT%\gnuwin32\bin;%PATH%
    REM Uncomment the below line when using a git checkout of the source repository
    REM SET PATH=%_ROOT%\qtrepotools\bin;%PATH%
    SET QMAKESPEC=win32-msvc2013
    SET _ROOT=

A desktop link can then be created by specifying the command `%SystemRoot%\system32\cmd.exe /E:ON /V:ON /k c:\qt\qt5vars.cmd` as application and `c:\qt\qt-5` as working directory.

Note: Setups for MinGW are similar; they differ only in that the `bin` folder of the installation should be added to the path instead of calling the Windows SDK setup script. For MinGW, please make sure that no `sh.exe` can be found in the path, as it affects `mingw32-make`.

Settings required by the additional libraries (see Qt for Windows Requirements) should also go this file below the call to the Windows SDK setup script.

## Step 4: Build the Qt Library

The default behavior of configure is to create an in-source build of Qt 5. If you want to install Qt 5 to a separate location, you need to specify the command line option `-prefix <location>`. Alternatively, the command line option `-developer-build` creates an in-source build for developer usage.

To configure the Qt library for a debug build for your machine, type the following command in the command prompt:

    configure -debug -nomake examples -opensource

The Configure Options page contains more information about the configure options.

To build Qt using jom, type:

    jom

If you do not have jom installed, type:

    nmake

For MinGW, type:

    mingw32-make

If an installation prefix was given, type `jom install`, `nmake install` or `mingw32-make install`.

Note: If you later need to reconfigure and rebuild Qt from the same location, ensure that all traces of the previous configuration are removed by entering the build directory and typing `nmake distclean` before running `configure` again.

## Parallel Builds

jom is a replacement for `nmake` which makes use of all CPU cores and thus speeds up building.