+LIB_SRC += backdoor.c # Backdoor IPC.
+
+# Filesystem code.
+FILESYS_SRC = filesys.c # Filesystem core.
+FILESYS_SRC += file.c # Individual files.
+FILESYS_SRC += filesys-stub.c # Stub helper code.
+
+# User process code.
+USERPROG_SRC = addrspace.c # Address spaces.