- Qbs Manual
- Managing Qt Versions
- Qbs 3.3.0

Configuring Profiles and Preferences ◦ Usage

# Managing Qt Versions

## Introduction

If your environment has the right `qmake` binary in its `PATH` and is also set up properly for a matching toolchain, then you do not necessarily need a profile to build projects with a Qt dependency. Otherwise, you should create one:

     qbs setup-qt /usr/bin/qmake myqt

This will create the `myqt` profile which can then be used on the command line:

     qbs profile:myqt

Note: If the `setup-toolchains` command has found more than one toolchain, you will need to manually link your Qt profile to one of them, like this:

     qbs config profiles.myqt.baseProfile <profile name>

## Multiple Qt Builds

To support multiple Qt builds, or in fact any combination of related settings, you need to create several profiles. The following example illustrates how to set up three different profiles, each for a different Qt build:

     qbs setup-qt ~/dev/qt/4.7/bin/qmake qt47
     qbs setup-qt ~/dev/qt/4.8/bin/qmake qt48
     qbs setup-qt ~/dev/qt/5.0/qtbase/bin/qmake qt5

You can set the default Qt build like this:

     qbs config defaultProfile qt5

To choose a Qt build that is different from the default, use:

     qbs build profile:qt48

You can set other properties in a profile (not just Qt ones), in the same way you override them from the command line. For example:

     qbs setup-qt C:\Qt\5.0.0\qtbase\bin\qmake.exe qt5
     qbs config profiles.qt5.qbs.architecture x86_64
     qbs config profiles.qt5.baseProfile msvc2010

The last example uses the inheritance feature of profiles. All settings in the profile set as `baseProfile` are known in the derived profile as well. They can of course be overridden there.