How do I point to a C++ library (non Qt library)

[ChrisL1234]

How do I point to a C++ library in Qt. Should I duplicate the below line in the dot pro file and point to a specific file:

include(../../src/qtsoap.pri)

EG: include(C:/abc/def/First Name Library)

When I do this and look at the compile output, I do not see the new path being used.

Is there some kind of instuction such as the below one that I should be using:

library(C:/abc/def/First Name Library)

Thank you,
Chris L.