[SOLVED] Undefined reference to functions

Undefined reference to functions

I am trying out C++ and QT but I am walking against a wall trying to solve this problem as most of this is not familiar.

I am trying to use the SIGAR library but I am getting the following message from QT:

/home/john/QT-projects/WidgetFirst/mainwindow.cpp:37: error: undefined reference to `sigar_open'

With a couple of other functions being undefined.

My best guess is that I didn't link something properly. The typhinting in the QT creator editor does work.

My .pro file looks like this:

QT       += core gui webkitwidgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = WidgetFirst
TEMPLATE = app

INCLUDEPATH += "/home/john/Cpp libraries/sigar-master/include"

LIBS += -lboost_system -L"/home/john/Cpp libraries/sigar-master/src"

SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

CONFIG += c++11

Could somebody tell me what I did wrong or what is missing?

Thanks in advance

Solution

Assuming there is lib directory:

LIBS += -lboost_system -L"/home/john/Cpp libraries/sigar-master/lib" \
                       -lspecific_lib