python-wxgtk-media3.0 is wxPython Classic, not Phoenix and is built
against GTK+ 2, not GTK+ 3 in Debian/Ubuntu. That's why libgtk-3-dev is
not a build dependency.
BTW, wxPython Phoenix will be included in Bionic.
** Changed in: wxpython3.0 (Ubuntu)
Status: New => Invalid
--
You
** Description changed:
Running `configure` of `wxpython` fails due to
```
- checking for GTK+ - version >= 3.0.0... Package gtk+-3.0 was not found in
the pkg-config search path.
- Perhaps you should add the directory containing `gtk+-3.0.pc'
- to the PKG_CONFIG_PATH
