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see https://gitlab.com/flightgear/simgear/-/work_items/56
fix compile with >=sci-libs/gdal-3.10
see https://github.com/OSGeo/gdal/pull/10605.patch
--- a/simgear/scene/dem/SGDemTile_gdal.cxx
+++ b/simgear/scene/dem/SGDemTile_gdal.cxx
@@ -546,7 +546,7 @@ void SGDemTile::doWarp( int iSrc, char* pszSrcFile, GDALDatasetH hDstDS, char**
if( bHaveNodata )
{
- if (CPLIsNan(dfReal))
+ if (std::isnan(dfReal))
printf( "Using internal nodata values (e.g. nan) for image %s.\n",
pszSrcFile );
else
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