guint gtk_get_micro_version ( void )
Returns the micro version number of the GTK library. (e.g. in GTK version 3.1.5 this is 5.)
This function is in the library, so it represents the GTK library
your code is are running against. Contrast with the
GTK_MICRO_VERSION macro, which represents the micro version of the
GTK headers you have included when compiling your code.