FindQt3 — CMake 4.1.2 Documentation

# FindQt3

This module finds Qt3, a cross-platform application development framework for creating graphical user interfaces and applications.

Note

This module is for Qt version 3. As of Qt version 5, the Qt upstream also provides an exported configuration to find Qt. New code should follow the `cmake-qt(7)` instead of using this module.

## Result Variables

This module sets the following variables:

`Qt3_FOUND`

  True if Qt3 has been found.

`QT_FOUND`

  True if Qt3 has been found. This variable is for compatibility with other Qt find modules.

`QT_VERSION_STRING`

  The version of Qt3 that was found.

`QT_LIBRARIES`

  Libraries needed to link against for using Qt3.

`QT_DEFINITIONS`

  A list of compile definitions to use when compiling code that uses Qt3.

## Cache Variables

The following cache variables may also be set:

`QT_INCLUDE_DIR`

  The directory containing `qt.h` and other Qt3 header files.

The following cache variables may also be set but are not meant for general use:

`QT_MOC_EXECUTABLE`

  Path to the `moc` tool.

`QT_UIC_EXECUTABLE`

  Path to the `uic` tool.

`QT_QT_LIBRARY`

  Path to the Qt3 library.

`QT_QTMAIN_LIBRARY`

  Path to the `qtmain` library. This is only required by Qt3 on Windows.

## Hints

`QT_MT_REQUIRED`

  To search for the multithreaded version of Qt3, set this variable to `TRUE` before looking for Qt3.

## Examples

Finding Qt3 on the system:

    find_package(Qt3)
    if(Qt3_FOUND)
      target_link_libraries(foo PRIVATE ${QT_LIBRARIES})
      target_include_directories(foo PRIVATE ${QT_INCLUDE_DIR})
      target_compile_definitions(foo PRIVATE ${QT_DEFINITIONS})
    endif()

Looking for the multithreaded version of Qt3:

    set(QT_MT_REQUIRED TRUE)
    find_package(Qt3)