-lib_SRC = lib/debug.c # Debug helpers.
-lib_SRC += lib/random.c # Pseudo-random numbers.
-lib_SRC += lib/stdio.c # I/O library.
-lib_SRC += lib/stdlib.c # Utility functions.
-lib_SRC += lib/string.c # String functions.
+lib_SRC = lib/debug.c # Debug helpers.
+lib_SRC += lib/random.c # Pseudo-random numbers.
+lib_SRC += lib/stdio.c # I/O library.
+lib_SRC += lib/stdlib.c # Utility functions.
+lib_SRC += lib/string.c # String functions.
+lib_SRC += lib/arithmetic.c # 64-bit arithmetic for GCC.
+lib_SRC += lib/ustar.c # Unix standard tar format utilities.