Simply use make clean; make to compile the allocator. This will produce a DSO named libguarder.so which may then be linked to applications at compile-time using the -rdynamic /path/to/libguarder.so flag.
To link to an existing, pre-compiled application, utilize the LD_PRELOAD environment variable when executing the program. For example: $ LD_PRELOAD=/path/to/libguarder.so ./program-to-run.