I'm in Code::Blocks, and for whatever reason, I cannot get started with gtkmm-3.0. Under Project -> Build options... -> Compiler settings --> Other options, I included the following...

```
`pkg-config gtkmm-3.0 --cflags --libs`
`pkg-config glibmm-2.4 --cflags --libs`

```

Obviously that should set everything up for using gtkmm-3.0 (which is indeed installed fully and properly), but I am getting errors from inside gtkmm-3.0.

> 
> /usr/include/gtkmm-2.4/gtkmm/papersize.h:37: undefined reference to 
>  `Glib::ustring::ustring(char const*)'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:37: undefined reference to` Glib::ustring::~ustring()'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:38: undefined reference to 
>  `Glib::ustring::ustring(char const*)'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:38: undefined reference to` Glib::ustring::~ustring()'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:39: undefined reference to 
>  `Glib::ustring::ustring(char const*)'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:39: undefined reference to` Glib::ustring::~ustring()'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:40: undefined reference to 
>  `Glib::ustring::ustring(char const*)'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:40: undefined reference to` Glib::ustring::~ustring()'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:41: undefined reference to 
>  `Glib::ustring::ustring(char const*)'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:41: undefined reference to` Glib::ustring::~ustring()'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:42: undefined reference to 
>  `Glib::ustring::ustring(char const*)'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:42: undefined reference to` Glib::ustring::~ustring()'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:43: undefined reference to 
>  `Glib::ustring::ustring(char const*)'
>  /usr/include/gtkmm-2.4/gtkmm/papersize.h:43: undefined reference to` Glib::ustring::~ustring()'
> 
> 
> 

I do NOT want to switch to another IDE. I like CodeBlocks. How do I fix this?