指定cmake使用qt4构建opencv

Question

我的Ubuntu电脑同时安装了qt4和qt5，因为它与一些lib兼容。目前，我想用qt4重建opencv（用于highgui）。但cmake始终使用qt5（默认版本）。我编辑了CMakeLists。txt文件

find_package(Qt4 COMPONENTS QTCORE QTGUI)
// I remove HAVE_QT5 variable
if(HAVE_QT)
  status("    QT 4.x:"            HAVE_QT        THEN "YES (ver ${QT_VERSION_MAJOR}.${QT_VERSION_MINOR}.${QT_VERSION_PATCH} ${QT_EDITION})" ELSE NO)
  status("    QT OpenGL support:" HAVE_QT_OPENGL THEN "YES (${QT_QTOPENGL_LIBRARY})" ELSE NO)
else()
...................

重建opencv后，我使用ldd libopencv_highgui检查依赖项。所以

libqt5核心。所以5 =

Highgui仍然链接到Qt5。有人能帮我吗？谢谢

Answer 1

要使用这两种Qt版本，请使用找到的变量。

# QtWidgets 5
find_package(Qt5Widgets)
if(Qt5Widgets_FOUND)
    set(QT5_FOUND TRUE)
    set(QT5_INCLUDE_DIRS "${Qt5Widgets_INCLUDE_DIRS}")
    set(QT5_LIBRARIES "${Qt5Widgets_LIBRARIES}")

# QtGui 4
find_package(Qt4 ${MINIMUM_REQUIRED_QT4_VERSION} COMPONENTS QtCore QtGui)
if(QT_FOUND)
    set(QT4_FOUND TRUE)
    set(QT4_INCLUDE_DIRS "${QT_INCLUDE_DIR};${QT_QTCORE_INCLUDE_DIR};${QT_QTGUI_INCLUDE_DIR}")
    set(QT4_LIBRARIES "${QT_QTCORE_LIBRARY};${QT_QTGUI_LIBRARY}")

如您所见，现在两个版本都可用，并且可以使用各自的include/library变量。