marble @4.10.1: error: use of undeclared identifier 'isnan'; did you mean 'std::isnan'?

[ryandesign (Ryan Carsten Schmidt)]

Building marble @4.10.1 fails on OS X 10.8.2 with Xcode 4.6:

[ 93%] /opt/local/var/macports/build/_Users_rschmidt_macports_dports_kde_marble/marble/work/marble-4.10.1/src/plugins/positionprovider/gpsd/GpsdPositionProviderPlugin.cpp:79:42: error: use of undeclared identifier 'isnan'; did you m[ 93%] ean 'std::isnan'?
    if ( data.status == STATUS_NO_FIX || isnan( data.fix.longitude ) || isnan( data.fix.latitude ) )
                                         ^~~~~
                                         std::isnan
/usr/include/c++/4.2.1/cmath:550:5: note: 'std::isnan' declared here
    isnan(_Tp __f) { return ::__gnu_cxx::__capture_isnan(__f); }
    ^

[NicosPavlov]

There is indeed some symbol issues in some kde ports recently. This one did not pop up in my tests or on the bot as it occurs in case of an opportunistic linking. Thanks for pointing it out. The link and the symbols should be fixed in r103867.