Fix incorrect variable for OS

Makefile

@@ -56,13 +56,13 @@ endif
 # OS dependent flags
 #
 OS := $(shell uname -s)
-ifeq ($(UNAME_S),Linux)
+ifeq ($(OS),Linux)
 	# installed by system and in PATH
 	CPPCHECK := cppcheck
 	DBG_REL +=
 endif
 # OpenIndiana and flavours
-ifeq ($(UNAME_S),SunOS)
+ifeq ($(OS),SunOS)
 	# local installation
 	CPPCHECK := $(HOME)/devl/cppcheck/bin/cppcheck
 	DBG_REL +=
@@ -119,11 +119,13 @@ $(APP): $(OBJS)
 $(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp
 	$(CXX) $(CXXFLAGS) -o $@  -c $<
 
-DIRS: obj bin
+.PHONEY: DIRS
+DIRS: 
 	mkdir  -p obj bin
 
 cppcheck.out: $(SRC)
 	$(info output to cppcheck.out)
+	$(info Check using: : $(CPPCHECK))
 	$(CPPCHECK) $(CHECKFLAGS) $^  > $@ 2>&1
 
 .PHONY: clean