So, by default we get:
...
(gdb) p freqs
$2 = {_M_t = {
    _M_impl = {<std::allocator<std::_Rb_tree_node<std::pair<char const, int> >
>> = {<__gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<char const, int> >
>> = {<No data fields>}, <No data fields>},
<std::_Rb_tree_key_compare<std::less<char> >> = {
        _M_key_compare = {<std::binary_function<char, char, bool>> = {<No data
fields>}, <No data fields>}}, <std::_Rb_tree_header> = {_M_header = {_M_color =
std::_S_red, _M_parent = 0x0, _M_left = 0x7fffffffdb18, 
          _M_right = 0x7fffffffdb18}, _M_node_count = 0}, <No data fields>}}}
...
instead of:
...
(gdb) p freqs
$1 = std::map with 0 elements
...

Users can install this relatively easily (as described at
https://sourceware.org/gdb/wiki/STLSupport), but it would be good to have a
better out-of-the-box experience.

Fedora does have this.