c++ - Qt 项目设置为版本 5 但 qtcreator 仍在寻找 qt4 头文件？

Question

这是项目 View 的屏幕截图:

这是.pro文件

#-------------------------------------------------
#
# Project created by QtCreator 2014-05-18T15:34:14
#
#-------------------------------------------------

QT       += core

QT       -= gui

TARGET = bedcoll
CONFIG   += console
CONFIG   -= app_bundle
QMAKE_CC = clang
QMAKE_CXX = clang++
QMAKE_CXXFLAGS += -std=c++11
QMAKE_CXXFLAGS += -D_FILE_OFFSET_BITS=64
INCLUDEPATH += /usr/include/c++/4.8
INCLUDEPATH += /usr/include/boost
LIBS += -lboost_system
LIBS += -lboost_filesystem
LIBS += -lboost_program_options

TEMPLATE = app


SOURCES += \
    src/util.cpp \
    src/bedcoll.cpp \
    src/main.cpp

HEADERS += \
    src/collgen_memo.h \
    src/util.h \
    src/bedcoll.h \
    src/error_enum.h

此项目在 kubuntu 13.10 上构建没有任何问题，但升级到 14.04 后，出现以下错误:

/usr/include/qt4/QtCore/qstring.h:1045: error: undefined reference to `QString::toAscii() const'
/usr/include/qt4/QtCore/qstring.h:880: error: undefined reference to `QString::free(QString::Data*)'
/usr/include/qt4/QtCore/qstring.h:879: error: undefined reference to `QString::shared_null'

Kubuntu 14.04 默认自带 qt5，但是 qtcreator 还在找 qt4，很迷惑。

Answer 1

@Netjat 说的对，清理一下就解决了，其实有个捷径，直接右击项目，选择“rebuild”即可。