The UPDATING File
The first thing you should do after the cvsup process has completed is read the file /usr/src/UPDATING. This file will contain important information about any special considerations that you need to watch out for when updating using the source code you just downloaded. It includes information on potential problems and any special procedures that you need to follow to avoid them. If anything in UPDATING contradicts something you read here, you should follow the instructions for that particular thing in UPDATING rather than the ones given in this book.