Creating a Patch File
A patch file captures the local changes (additions and deletions) to the source code. It can be shared on R's Bugzilla to propose a change to R, e.g. a fix for a bug.
To make a patch
1) Update your local copy of the source
If you have not recently updated your local copy of the R Subversion repository, follow the instructions in Updating the Source Code to do this first.
2) Create a patch file
Go to the source directory and use svn diff to create a patch.
The patch file will be saved in the directory specified by the PATCHDIR environment variable that is defined when the codespace starts