Checking things are up-to-date:

> cd $CCP4

> cvs status | grep -i locally (will identify locally modified files)

> cvs status | grep -i needs   (will identify files which need patching
                                or merging)
> cvs status | grep -i conflict (identify files which have conflicts)

Making patch branch:

> cvs tag -b -r release- release-_patch

Releases can be made from the patch branch as for those from the main
trunk, e.g

> cvs tag -r release-_patch release-

Making patch between different versions:

> cd $CCP4
> cvs rdiff -r release- -r release- ccp4 > ccp4--.diff