Rebuild all if Makefile changes

Makefile

@@ -1,6 +1,6 @@
 CC           =  gcc
 LD           =  $(CC)
-CFLAGS       =  -Wall -Wextra -Wno-unused-parameter -ggdb
+CFLAGS       =  -std=gnu17 -Wall -Wextra -Wno-unused-parameter -ggdb
 CPPFLAGS     += -Iinclude
 LDFLAGS      +=
 ifndef DEBUG
@@ -9,31 +9,29 @@ CPPFLAGS     += -DNDEBUG
 else
 CPPFLAGS     += -DDEBUG
 endif
-BUILDDIR	  = build
+BUILDDIR	  =  build
 
 SOURCES = $(wildcard src/*.c)
 TEST_SOURCES = $(wildcard test/*.c)
 OBJECTS = $(addprefix $(BUILDDIR)/,$(SOURCES:.c=.o))
 DEPS	= $(addprefix $(BUILDDIR)/,$(SOURCES:.c=.d)) $(addprefix $(BUILDDIR)/,$(TEST_SOURCES:.c=.d))
-LIB     = liblilalloc
+LIB     = liblilalloc.a
 TEST_BINS = $(patsubst test/%.c,$(BUILDDIR)/test/%,$(TEST_SOURCES))
 
 .PHONY: all
-all:  $(BUILDDIR)/$(LIB).a
+all:  $(BUILDDIR)/$(LIB)
 
 
-$(BUILDDIR)/%.o: %.c
+$(BUILDDIR)/%.o: %.c Makefile
 	mkdir -p $(@D)
 	$(CC) $(CPPFLAGS) $(CFLAGS) -MMD -MP -c -o $@ $<
 
-$(BUILDDIR)/$(LIB).a: $(OBJECTS)
+$(BUILDDIR)/$(LIB): $(OBJECTS)
 	ar crs $@ $^
 
-
-$(BUILDDIR)/test/%: test/%.c $(BUILDDIR)/$(LIB).a
+$(BUILDDIR)/test/%: test/%.c $(BUILDDIR)/$(LIB)
 	mkdir -p $(@D)
-	$(CC) $(CPPFLAGS) $(CFLAGS) -MMD -MP -o $@ $< $(BUILDDIR)/$(LIB).a
-
+	$(CC) $(CPPFLAGS) $(CFLAGS) -MMD -MP -o $@ $< $(BUILDDIR)/$(LIB)
 
 .PHONY: test
 test: $(TEST_BINS)
@@ -44,8 +42,6 @@ test: $(TEST_BINS)
 		echo ; \
 	done
 
-
-
 .PHONY: clean
 clean:
 	rm -rf $(BUILDDIR)