To compile for systems without much space (floppy distributions etc), you can create a single binary. This will save disk space by avoiding repeated code between the various parts. If you are familiar with "busybox", it's the same principle.
Both the multi-binary (dropbearmulti) and the separate executables
(dropbear, dbclient) are built by make by default; to build just the
multi-binary, run make multi.
To use the binary, symlink it from the desired executable:
ln -s dropbearmulti dropbear
ln -s dropbearmulti dbclient
etc.
Then execute as normal:
./dropbear <options here>