rem: ksa = icalenum_property_kind_to_string(kinda); ksb = icalenum_property_kind_to_string(kindb);
add: ksa = icalproperty_kind_to_string(kinda); ksb = icalproperty_kind_to_string(kindb);
context: int icalcomponent_property_sorter(void *a, void *b){    icalproperty_kind kinda, kindb;    const char *ksa, *ksb;    kinda = icalproperty_isa((icalproperty*)a);    kindb = icalproperty_isa((icalproperty*)b);    ksa = icalenum_property_kind_to_string(kinda);    ksb = icalenum_property_kind_to_string(kindb);    return strcmp(ksa,ksb);}