Pieter de Goeje wrote:

This will replace mysql50-client with mysql51-client and reinstall all ports depending on mysql50-client ("-rf"), so they will use the new version. In this case the last step probably isn't necessary because the libraries are (mostly I think) compatible, but in general it is recommended.

Rebuilding all dependents when upgrading from mysql50 to mysql51 is absolutely
required.  mysql50-client installs ${LOCALBASE}/lib/mysql/libmysqlclient.so.15
whereas mysql51-client installs ${LOCALBASE}/lib/mysql/libmysqlclient.so.16
-- note the changed ABI version number. Unless you use portupgrade(1) or save a copy of the old shlib by other means, anything that linked against
libmysqlclient would be rendered inoperable by the change, and must at least be
re-linked.  Yes, the APIs have not changed, but APIs are a matter for 
at the time of writing the source code -- once compiled, it's the ABI that 



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