'qNextPowerOfTwo' was not declared in this scope - Qt

Question

I recently installed Qt in Lubuntu and I'm getting the following error

This function is provided by QtMath library which IS included in the file.

any advice here? I have the same project in Windows but I have no such problem. Thanks for your time. Best regards

Peter

P.S. I enclose the .pro file the relevant code to the question is already in the images. I'm using Qt 5.2.1 (GCC 4.8.2, 32bit)

#-------------------------------------------------
#
# Project created by QtCreator 2016-04-26T18:35:07
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport

QMAKE_CXXFLAGS += -std=c++0x

TARGET = WaveMod
TEMPLATE = app


SOURCES +=\
    mainwindow.cpp \
trace_ex.cpp \
trace_group_ex.cpp \
qcustomplot.cpp \
main.cpp \
fft_complx.cpp \
geom_ex.cpp


HEADERS  += mainwindow.h \
trace_ex.h \
trace_group_ex.h \
qcustomplot.h \
fft_complx.h \
geom_ex.h \

FORMS    += mainwindow.ui \
trace_ex.ui \
trace_group_ex.ui \
geom_ex.ui

DISTFILES += \
geom_map.qml

Answer 1

In the documentation of the function it says.

This function was introduced in Qt 5.4.

Try upgrading your Qt setup if you need that function, or have a look here.