When changing the version number of ooRexx you will need to change the following files: oorexx.ver configure.ac CHANGES ReleaseNotes api/oorexxapi.h (REXX_INTERPRETER_5_x_x) extensions/rxftp/rxftp.cls platform/unix/rexx.1 platform/unix/rexxc.1 platform/unix/rxqueue.1 platform/unix/rxsubcom.1 When the library interface changes you need to modify the oorexx.ver file. BE CAREFUL! Some of this info has no relationship to the ooRexx package version! If you don't know what you are doing, then don't do anything!