qt c++加入第三方库不断报LNK2019

[klyjm]

最近要做qt c++与matlab的混合编程，调用matlab计算引擎要引入matlab的第三方库，但是我在Pro文件里面写好LIBS以后不断报LNK2019的错，我在pro文件里写的代码是这样的：
LIBS += -L$$quote(C:/Program Files/MATLAB/R2016b/extern/lib/win64/microsoft) -llibmx
LIBS += -L$$quote(C:/Program Files/MATLAB/R2016b/extern/lib/win64/microsoft) -llibmat
LIBS += -L$$quote(C:/Program Files/MATLAB/R2016b/extern/lib/win64/microsoft) -llibeng
LIBS += -L$$quote(C:/Program Files/MATLAB/R2016b/extern/lib/win64/microsoft) -lmclmcr
LIBS += -L$$quote(C:/Program Files/MATLAB/R2016b/extern/lib/win64/microsoft) -lmclmcrrt
INCLUDEPATH += $$quote(C:/Program Files/MATLAB/R2016b/extern/include)
INCLUDEPATH += $$quote(C:/Program Files/MATLAB/R2016b/extern/include/win64)
INCLUDEPATH += $$quote(C:/Program Files/MATLAB/R2016b/bin/win64)
DEPENDPATH += $$quote(C:/Program Files/MATLAB/R2016b/bin/win64)
报的错是这样的：
mainwindow.obj:-1: error: LNK2019: 无法解析的外部符号 _engEvalString，该符号在函数 "private: void __thiscall MainWindow::on_pushButton_2_clicked(void)" (?on_pushButton_2_clicked@MainWindow@@AAEXXZ) 中被引用

有人遇到过么？能解决么？