1 contains(QT_CONFIG, opengles1) {

     2     INCLUDEPATH += $$QMAKE_INCDIR_OPENGL_ES1

     3     !isEmpty(QMAKE_LIBDIR_OPENGL_ES1):QMAKE_LIBDIR += $$QMAKE_LIBDIR_OPENGL_ES1

     4     target_qt:LIBS_PRIVATE += $$QMAKE_LIBS_OPENGL_ES1_QT

     5     else:LIBS += $$QMAKE_LIBS_OPENGL_ES1

     6 } else:contains(QT_CONFIG, opengles2) {

     7     INCLUDEPATH += $$QMAKE_INCDIR_OPENGL_ES2

     8     !isEmpty(QMAKE_LIBDIR_OPENGL_ES2):QMAKE_LIBDIR += $$QMAKE_LIBDIR_OPENGL_ES2

     9     target_qt:LIBS_PRIVATE += $$QMAKE_LIBS_OPENGL_ES2_QT

    10     else:LIBS += $$QMAKE_LIBS_OPENGL_ES2

    11 } else {

    12     INCLUDEPATH += $$QMAKE_INCDIR_OPENGL

    13     !isEmpty(QMAKE_LIBDIR_OPENGL):QMAKE_LIBDIR += $$QMAKE_LIBDIR_OPENGL

    14     target_qt:LIBS_PRIVATE += $$QMAKE_LIBS_OPENGL_QT

    15     else:LIBS += $$QMAKE_LIBS_OPENGL

    16 }

    17 

    18 contains(QT_CONFIG, egl) {

    19     !isEmpty(QMAKE_LIBS_EGL): LIBS += $$QMAKE_LIBS_EGL

    20 }

    21