The following describes the most significant changes which occurred in the AST library between versions V5.5-0 and V5.6-0:
grf.h. The ast_link command has been modified so that the
-grf_v3.2switch loads dummy versions of the new grf functions. This means that applications that use the
-grf_v3.2switch should continue to build without any change. However, the new public functions astBBuf and astEBuf will report an error unless the new grf functions are implemented. If you choose to implement them, you should modify your linking procedure to use the
-grf_v5.6) switch in place of the older
-grf_v3.2switch. See the description of the ast_link command for details of these switches.
AST A Library for Handling World Coordinate Systems in Astronomy