how to add compiler option for a library

[Dean21]

Hi everyone so I am trying to use the mosquitto mqtt open source library with my qt c++ widget application. But I am having trouble getting qt creator to compile I have tried adding QMAKE_CXXFLAGS += -lmosquitto
But it doesn't work as I still get lots of errors saying undefined reference to 'function name here'

Does anyone know how to add third party library compiler options?

FYI: I am on ubuntu, creating a widget application and am using qmake

Any help with this would be greatly appreciated,
Thanks in advance,
Dean

[SGaist]

Hi and welcome to devnet,

LIBS += -lmosquito

Should do the trick if mosquito is installed in a standard location.

On a side note, Qt has its own mqtt module that is cross-platform as well.

[Dean21]

@SGaist Great Thank you this, I know that qt has its own MQTT module just I had already developed my code for MQTT using the mosquitto library before I knew I was going to be making a GUI using QT.