inkscape Portfile thinko

[Jack Howarth]

   Is it really intended in the inkscape Portfile that -std=c++11 be passed to ALL clang compilers
or just for 10.9 or later...

if {[string match "*clang*" ${configure.compiler}]} {
    configure.cxxflags-append -std=c++11
}

Considering that clang++ before darwin13 defaults to -stdlib=libstdc++ which lacks
c++11 support, the current Portfile seems non-sensical on this issue.
         Jack