Gentoo's Bugzilla –
Attachment 908684 Details for
Bug 943401dev-cpp/eigen-3.4.0-r3[+test] - .../unsupported/test/cxx11_tensor_expr.cpp: In function 'void test_minmax_nan_propagation_templ()': .../unsupported/test/cxx11_tensor_expr.cpp:311:5: error: 'vec_all_nan' was not declared in this scope