Writing portable code

[Esdras Beleza <linux esdrasbeleza com>]

Hi folks,

Please, I'd like to know some tips to write portable gtkmm code that would compile and run in Linux, Windows, MacOS etc. 

My first question is: what is an easy way to determine the user configuration directory, like ~/.config or C:\Documents and Settings\Username\Application Data\? Does Gtkmm, Glib or anything have any support to determine this kind of information, like system details, directory separator, etc.?

Thanks,

Esdras