Gentoo's Bugzilla –
Attachment 770879 Details for
Bug 838466sys-block/gparted-1.3.1 - GParted_Core.cc: In constructor 'GParted::GParted_Core::GParted_Core()': GParted_Core.cc:73:64: error: invalid 'static_cast' from type 'std::nullptr_t' to type 'PedPartitionFlag' (on musl)