ElonH 698a4af761
wxbase: invert is_installed
this_prefix has been given in wx-config,
so the result of is_installed isn't proper
```
if is_installed; then
    _include_cppflags="-I${includedir}/wx-2.8"
else
    _include_cppflags="-I${includedir} -I${prefix}/contrib/include"
fi
```
2020-04-04 16:22:48 +08:00
..
2020-04-04 16:22:48 +08:00