The remerge-missing-binaries utility, usually located at /usr/bin/remerge-missing-binaries, should be used periodically by the build-server administrator to ensure that any "missing" binary packages which would have been produced by the build-space but have now mysteriously disappeared are regenerated.
The remerge-missing-binaries utility, when run with no options, will check that all packages installed in the build-space have a matching binary package available and will remerge any which do not. There are two parameters which modify this behaviour and both are demonstrated below.
The first parameter in the above example, --pretend or -p, is self explanatory. The second parameter, --include-bdeps or -b, instructs the remerge-missing-binaries utility check for missing binary packages of build-time dependencies which will not have any impact on the usability of the package repository but may be of interest. As you can see if there are no missing packages then no output will be produced.