I recently spent some time resolving the issues building hugin-app. It builds fine for me on Mavericks.
The portion of the log you quoted above does not show any error; it only shows warnings and notes. The actual error is:
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_graphics_hugin-app/hugin-app/work/hugin-2013.0.0/src/foreign/vigra/vigra_impex/imageinfo.cxx:275:18: error: out-of-line definition of 'ImageExportInfo' does not match any declaration in 'vigra::ImageExportInfo'
:info:build ImageExportInfo::ImageExportInfo( const char * filename )
:info:build ^~~~~~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_graphics_hugin-app/hugin-app/work/hugin-2013.0.0/src/foreign/vigra/vigra_impex/imageinfo.cxx:443:18: error: out-of-line definition of 'ImageImportInfo' does not match any declaration in 'vigra::ImageImportInfo'
:info:build ImageImportInfo::ImageImportInfo( const char * filename )
:info:build ^~~~~~~~~~~~~~~
:info:build 2 errors generated.
I've seen some "out-of-line definition
" errors in other tickets but I'm not seeing them with this port. Please indicate your version of Xcode and clang; maybe they're different from mine.