#6 Undefined reference to presage predict on qprompter compile

[E Seng On]

I am trying to build "qprompter" on my windows machine but the following errors show up: 

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error: undefined reference to Presage::completion(std::string)' error: undefined reference toPresage::predict()'

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I have installed QScintilla-2.9.1  and Presage(at c:/presage) from presage-0.9.2~beta20150909-32bit-setup.exe and linked the library. 
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here is qprompter.pro 
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CONFIG       += release
HEADERS       = mainwindow.h
SOURCES       = main.cpp \                
mainwindow.cpp
RESOURCES     = qprompter.qrc
QT           += widgets 
LIBS         += -lqscintilla2 -Lc:/presage/lib/ -lpresage
INCLUDEPATH   = c:/presage/include 
DEPENDPATH   = c:/presage/include 

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My machine spec is:
OS: WIndows 8(64bit) 
Qt 5.4.1 MinGW32bit(MinGW491)

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Please help me why this error message is coming up 

[E Seng On]

Issue solved