awesome-widgets 3.1.0 make failure

awesome-widgets.log

$ make
Scanning dependencies of target awesomewidgets_automoc
[  1%] Automatic moc for target awesomewidgets
Generating moc_qreplytimeout.cpp
Generating moc_abstractextitem.cpp
Generating moc_abstractextitemaggregator.cpp
Generating moc_extquotes.cpp
Generating moc_extscript.cpp
Generating moc_extupgrade.cpp
Generating moc_extweather.cpp
Generating moc_graphicalitem.cpp
[  1%] Built target awesomewidgets_automoc
[  2%] Generating ui_extquotes.h
[  4%] Generating ui_extupgrade.h
[  5%] Generating ui_graphicalitem.h
[  7%] Generating ui_extscript.h
[  8%] Generating ui_extweather.h
Scanning dependencies of target awesomewidgets
[  9%] Building CXX object awesomewidgets/CMakeFiles/awesomewidgets.dir/extupgrade.cpp.o
[ 11%] Building CXX object awesomewidgets/CMakeFiles/awesomewidgets.dir/extweather.cpp.o
[ 12%] Building CXX object awesomewidgets/CMakeFiles/awesomewidgets.dir/extscript.cpp.o
[ 14%] Building CXX object awesomewidgets/CMakeFiles/awesomewidgets.dir/graphicalitem.cpp.o
[ 15%] Building CXX object awesomewidgets/CMakeFiles/awesomewidgets.dir/abstractextitemaggregator.cpp.o
[ 16%] Building CXX object awesomewidgets/CMakeFiles/awesomewidgets.dir/extquotes.cpp.o
[ 18%] Building CXX object awesomewidgets/CMakeFiles/awesomewidgets.dir/abstractextitem.cpp.o
[ 19%] Building CXX object awesomewidgets/CMakeFiles/awesomewidgets.dir/graphicalitemhelper.cpp.o
/tmp/awesome-widgets/awesomewidgets/graphicalitemhelper.cpp: In member function ‘float GraphicalItemHelper::getPercents(const float&, const float&, const float&)’:
/tmp/awesome-widgets/awesomewidgets/graphicalitemhelper.cpp:167:20: error: ‘isnan’ was not declared in this scope
     if (isnan(value))
                    ^
/tmp/awesome-widgets/awesomewidgets/graphicalitemhelper.cpp:167:20: note: suggested alternative:
In file included from /usr/include/c++/5.3.0/random:38:0,
                 from /usr/include/c++/5.3.0/bits/stl_algo.h:66,
                 from /usr/include/c++/5.3.0/algorithm:62,
                 from /usr/include/qt/QtCore/qglobal.h:85,
                 from /usr/include/qt/QtGui/qrgb.h:37,
                 from /usr/include/qt/QtGui/qcolor.h:37,
                 from /usr/include/qt/QtGui/QColor:1,
                 from /tmp/awesome-widgets/awesomewidgets/graphicalitemhelper.h:21,
                 from /tmp/awesome-widgets/awesomewidgets/graphicalitemhelper.cpp:18:
/usr/include/c++/5.3.0/cmath:641:5: note:   ‘std::isnan’
     isnan(_Tp __x)
     ^
awesomewidgets/CMakeFiles/awesomewidgets.dir/build.make:250: recipe for target 'awesomewidgets/CMakeFiles/awesomewidgets.dir/graphicalitemhelper.cpp.o' failed
make[2]: *** [awesomewidgets/CMakeFiles/awesomewidgets.dir/graphicalitemhelper.cpp.o] Error 1
CMakeFiles/Makefile2:182: recipe for target 'awesomewidgets/CMakeFiles/awesomewidgets.dir/all' failed
make[1]: *** [awesomewidgets/CMakeFiles/awesomewidgets.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2