makefile add

Makefile

@@ -0,0 +1,13 @@
+CC = gcc
+CFLAGS = -O2 -Wall
+
+all: guess_signals guess_pipe
+
+guess_signals: guess_signals.c
+	$(CC) $(CFLAGS) -o guess_signals guess_signals.c
+
+guess_pipe: guess_pipe.c
+	$(CC) $(CFLAGS) -o guess_pipe guess_pipe.c
+
+clean:
+	rm -f guess_signals guess_pipe