Jasper "older c version" warning

I am getting the following warning when building on Arch Linux using jasper 3.0.4:

[2093/6700 7.7/sec] Building CXX object qtimageformats/src/plugins/imageformats/jp2/CMakeFiles/QJp2Plugin.dir/qjp2handler.cpp.o
In file included from /home/jonas/Code/qt5/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp:47:
In file included from /usr/include/jasper/jasper.h:73:
/usr/include/jasper/jas_config.h:115:2: warning: "Your code is being built against an older version of the C standard than JasPer was. Although this is supported, this may require some extra preprocessor defines when building." -W#warnings
#warning "Your code is being built against an older version of the C standard than JasPer was. Although this is supported, this may require some extra preprocessor defines when building."
^
1 warning generated./usr/include/jasper/jas_config.h