the required major version
the required minor version
the required micro version
null if the GTK library is compatible with the given version, or a string describing the version mismatch. The returned string is owned by GTK and should not be modified or freed.
Checks that the GTK library in use is compatible with the given version.
Generally you would pass in the constants GTK_MAJOR_VERSION, GTK_MINOR_VERSION, GTK_MICRO_VERSION as the three arguments to this function; that produces a check that the library in use is compatible with the version of GTK the application or module was compiled against.
Compatibility is defined by two things: first the version of the running library is newer than the version required_major.required_minor.required_micro. Second the running library must be binary compatible with the version required_major.required_minor.required_micro (same major version.)
This function is primarily for GTK modules; the module can call this function to check that it wasn’t loaded into an incompatible version of GTK. However, such a check isn’t completely reliable, since the module may be linked against an old version of GTK and calling the old version of gtk.global.checkVersion, but still get loaded into an application using a newer version of GTK.