int im_version( int flag )
const char *im_version_string( void )
im_version(3) returns the major version number if flag == 0, the minor version number if flag == 1, and the micro version number if flag == 2.
Major versions are supposed to represent very large changes to the library, minor versions indicate steady improvements (with odd minor versions indicating unstable and undocumented development releases), and micro versions indicating bug-fixes.
im_version_string(3) returns a static string representing the vips version number, and the date when the library was built.
The version number always has three parts, separated by '.' characters. The first part is the major release, the second the minor release (odd minor values denote development releases), and the third the micro version number.
The version number and the date are separated by a '-' character.
The value of this string is constructed in 'configure.in'.
A typical value for tthe string might be "7.7.0-Thu Dec 16 18:10:01 GMT 1999".