[ctrtool] Fix compile errors

And comparisons which would have always returned false.

ctrtool/Makefile

@@ -3,12 +3,27 @@ SRC_DIR = . polarssl tinyxml
 OBJS = $(foreach dir,$(SRC_DIR),$(subst .c,.o,$(wildcard $(dir)/*.c))) $(foreach dir,$(SRC_DIR),$(subst .cpp,.o,$(wildcard $(dir)/*.cpp)))
 
 # Compiler Settings
-LIBS = -static-libgcc -static-libstdc++
-CXXFLAGS = -I. 
-CFLAGS = -O2 -flto -Wall -Wno-unused-variable -Wno-unused-but-set-variable -Wno-unused-result -I.
 OUTPUT = ctrtool
+CXXFLAGS = -I.
+CFLAGS = -O2 -flto -Wall -Wno-unused-variable  -Wno-unused-result -I.
 CC = gcc
 CXX = g++
+ifeq ($(OS),Windows_NT)
+    #Windows Build CFG
+    CFLAGS += -Wno-unused-but-set-variable
+    LIBS += -static-libgcc -static-libstdc++
+else
+    UNAME_S := $(shell uname -s)
+    ifeq ($(UNAME_S),Darwin)
+        # OS X
+        CFLAGS += -Wno-unused-local-typedef
+        LIBS += -liconv
+    else
+        # Linux
+        CFLAGS += -Wno-unused-but-set-variable
+        LIBS +=
+    endif
+endif
 
 main: $(OBJS)
 	$(CXX) -o $(OUTPUT) $(LIBS) $(OBJS)