The.pro file QMAKE_LFLAGS += -lpthread is equivalent to LIBS += -lpthread

1. Qmake mode of QtCreator is used in Linux:

The.pro file QMAKE_LFLAGS += -lpthread is equivalent to LIBS += -lpthread

2. CMake mode

# specify compile options, method 1

ADD_DEFINITIONS(-lz -lpthread -lrt)

# specify compile options, method 2

set(CMAKE_CXX_FLAGS “${CMAKE_CXX_FLAGS} -lz -lpthread -lrt”)