nomacs/nomacs: FTBFS on Arch Linux

output-make.txt

Generating moc_DkThumbsWidgets.cpp
Generating moc_DkToolbars.cpp
Generating moc_DkViewPort.cpp
Generating moc_DkWidgets.cpp
[ 44%] Built target nomacsGui_automoc
Scanning dependencies of target nomacsGui
[ 45%] Building CXX object CMakeFiles/nomacsGui.dir/src/DkGui/DkPong.cpp.o
/usr/local/peter/Tests/nomacs/Projekt/nomacs/ImageLounge/src/DkGui/DkPong.cpp: In member function ‘void nmc::DkBall::fixAngle()’:
/usr/local/peter/Tests/nomacs/Projekt/nomacs/ImageLounge/src/DkGui/DkPong.cpp:658:19: error: call of overloaded ‘abs(double&)’ is ambiguous
  angle = abs(angle);
                   ^
In file included from /usr/include/c++/6.1.1/cstdlib:75:0,
                 from /usr/include/c++/6.1.1/bits/stl_algo.h:59,
                 from /usr/include/c++/6.1.1/algorithm:62,
                 from /usr/include/qt/QtCore/qglobal.h:85,
                 from /usr/include/qt/QtGui/qwindowdefs.h:37,
                 from /usr/include/qt/QtWidgets/qwidget.h:37,
                 from /usr/include/qt/QtWidgets/qmainwindow.h:37,
                 from /usr/include/qt/QtWidgets/QMainWindow:1,
                 from /usr/local/peter/Tests/nomacs/Projekt/nomacs/ImageLounge/src/DkGui/DkPong.h:31,
                 from /usr/local/peter/Tests/nomacs/Projekt/nomacs/ImageLounge/src/DkGui/DkPong.cpp:28:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/include/c++/6.1.1/bits/stl_algo.h:59:0,
                 from /usr/include/c++/6.1.1/algorithm:62,
                 from /usr/include/qt/QtCore/qglobal.h:85,
                 from /usr/include/qt/QtGui/qwindowdefs.h:37,
                 from /usr/include/qt/QtWidgets/qwidget.h:37,
                 from /usr/include/qt/QtWidgets/qmainwindow.h:37,
                 from /usr/include/qt/QtWidgets/QMainWindow:1,
                 from /usr/local/peter/Tests/nomacs/Projekt/nomacs/ImageLounge/src/DkGui/DkPong.h:31,
                 from /usr/local/peter/Tests/nomacs/Projekt/nomacs/ImageLounge/src/DkGui/DkPong.cpp:28:
/usr/include/c++/6.1.1/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/include/c++/6.1.1/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
CMakeFiles/nomacsGui.dir/build.make:148: recipe for target 'CMakeFiles/nomacsGui.dir/src/DkGui/DkPong.cpp.o' failed
make[2]: *** [CMakeFiles/nomacsGui.dir/src/DkGui/DkPong.cpp.o] Error 1
CMakeFiles/Makefile2:184: recipe for target 'CMakeFiles/nomacsGui.dir/all' failed
make[1]: *** [CMakeFiles/nomacsGui.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2