diff --git a/04_Multifile/Makefile b/04_Multifile/Makefile
new file mode 100644
index 0000000..0af158c
--- /dev/null
+++ b/04_Multifile/Makefile
@@ -0,0 +1,53 @@
+GENERATES = prog prog-a prog-so README libout.a libout.so
+TRASH = *.o *~ o.*
+
+%.o: %.c
+	cc $< -c -o $@
+
+fun.o: outlib.h
+
+all: README prog prog-a
+
+prog: const.o fun.o prog.o
+	cc $^ -o $@
+
+prog-a: libout.a prog.o
+	cc -L. prog.o -lout -o prog-a
+
+libout.a: const.o fun.o
+	ar -rcs libout.a const.o fun.o
+
+
+prog-so: libout.so prog.o
+	cc -L. prog.o -lout -o prog-so
+
+libout.so: const.c fun.c outlib.h
+	cc fun.c -c -fPIC -o fun-pic.o
+	cc const.c -c -fPIC -o const-pic.o
+	cc -shared fun-pic.o const-pic.o -o libout.so
+
+
+test: prog prog-a prog-so
+	./prog hello 2>&1 > prog.test.o
+	./prog-a hello 2>&1 > prog-a.test.o
+	LD_LIBRARY_PATH=`pwd` ./prog-so hello 2>&1 > prog-so.test.o
+	cmp prog.test.o prog-a.test.o
+	cmp prog-a.test.o prog-so.test.o
+
+	./prog hell o world 2>&1 > prog.test.o
+	./prog-a hell o world 2>&1 > prog-a.test.o
+	LD_LIBRARY_PATH=`pwd` ./prog-so hell o world 2>&1 > prog-so.test.o
+	cmp prog.test.o prog-a.test.o
+	cmp prog-a.test.o prog-so.test.o
+
+
+
+README: prog
+	./$< 2> $@
+
+clean:
+	rm -f $(TRASH)
+
+distclean: clean
+	rm -rf $(GENERATES)
+
diff --git a/04_Multifile/README b/04_Multifile/README
new file mode 100644
index 0000000..c0bcd94
--- /dev/null
+++ b/04_Multifile/README
@@ -0,0 +1,2 @@
+./prog v0.00: Print all arguments
+	Usage: ./prog arg1 [arg2 […]]
diff --git a/04_Multifile/const.c b/04_Multifile/const.c
new file mode 100644
index 0000000..65c3545
--- /dev/null
+++ b/04_Multifile/const.c
@@ -0,0 +1 @@
+int Count=0;
diff --git a/04_Multifile/fun.c b/04_Multifile/fun.c
new file mode 100644
index 0000000..0b3ecf8
--- /dev/null
+++ b/04_Multifile/fun.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include "outlib.h"
+
+void output(char *str) {
+        printf("%d: %s\012", Count++, str);
+}
+
+void usage(char *prog) {
+    fprintf(stderr, "%s v%.2f: Print all arguments\012\t"\
+                "Usage: %s arg1 [arg2 […]]\012", prog, VERSION, prog);
+}
diff --git a/04_Multifile/outlib.h b/04_Multifile/outlib.h
new file mode 100644
index 0000000..15b4731
--- /dev/null
+++ b/04_Multifile/outlib.h
@@ -0,0 +1,4 @@
+void output(char *);
+void usage(char *);
+extern int Count;
+#define VERSION 0.0