Build Qt5.15 from source failed

Acrophobic

Hi everyone. I'm trying to build Qt5.15.0 from the source. Unfortunately it failed with following message :

qjp2handler.cpp: In member function ‘bool Jpeg2000JasperReader::write(const QImage&, int)’:
qjp2handler.cpp:844:41: error: ‘pow’ was not declared in this scope
  844 |     const double jasperRate = minRate + pow((double(quality) / double(maxQuality)), 2) * maxRate;
      |                                         ^~~
make[5]: *** [Makefile:1169: .obj/qjp2handler.o] Error 1
make[5]: Leaving directory '/home/radhi/Downloads/Qt/qt-everywhere-src-5.15.0/qtimageformats/src/plugins/imageformats/jp2'
make[4]: *** [Makefile:215: sub-jp2-install_subtargets] Error 2
make[4]: Leaving directory '/home/radhi/Downloads/Qt/qt-everywhere-src-5.15.0/qtimageformats/src/plugins/imageformats'
make[3]: *** [Makefile:59: sub-imageformats-install_subtargets] Error 2
make[3]: Leaving directory '/home/radhi/Downloads/Qt/qt-everywhere-src-5.15.0/qtimageformats/src/plugins'
make[2]: *** [Makefile:85: sub-plugins-install_subtargets] Error 2
make[2]: Leaving directory '/home/radhi/Downloads/Qt/qt-everywhere-src-5.15.0/qtimageformats/src'
make[1]: *** [Makefile:60: sub-src-install_subtargets] Error 2
make[1]: Leaving directory '/home/radhi/Downloads/Qt/qt-everywhere-src-5.15.0/qtimageformats'
make: *** [Makefile:275: module-qtimageformats-install_subtargets] Error 2

My OS is Manjaro Linux with kernel 5.8.1-3. I've installed all required dependencies as listed in wiki. Here is my configuration flags :

./configure \
	-prefix "/home/radhi/Development/SDK/Qt5.15" \
	-opensource \
	-confirm-license \
	-release \
	-optimize-size \
	-make libs \
	-nomake tools \
	-nomake examples \
	-nomake tests \
	-skip qtwebengine

Any idea why and how to fix it ? Thank you.

j.goebbert

You are missing the following fix:
https://github.com/qt/qtimageformats/commit/704868db61be1542c2d9e2b75ead00c45c56cc36