public uint get_micro_version ()
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 MICRO_VERSION macro, which represents the micro version of the GTK+ headers you have included when compiling your code.
the micro version number of the GTK+ library