Now uses the .PHONY directive correctly

Makefile

@@ -7,7 +7,9 @@
 CC = gcc
 CFLAGS = -std=c99 -pedantic -Wall -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -D_POSIX_C_SOURCE=200809L -g -c
 
-.PHONY all: myexpand
+.PHONY: all clean docs docs_clean
+
+all: myexpand
 
 myexpand: myexpand.o
 	$(CC) -o $@ $^
@@ -15,11 +17,11 @@ myexpand: myexpand.o
 %.o: %.c
 	$(CC) $(CFLAGS) $^
 
-.PHONY docs: Doxyfile myexpand.c
+docs: Doxyfile myexpand.c
 	doxygen Doxyfile
 
-.PHONY docs_clean:
+docs_clean:
 	rm -rf html
 
-.PHONY clean:
+clean:
 	rm -f myexpand.o myexpand