diff --git a/ctrtool/Makefile b/ctrtool/Makefile
index 7a534c9..55bc16b 100644
--- a/ctrtool/Makefile
+++ b/ctrtool/Makefile
@@ -8,25 +8,25 @@ CXXFLAGS = -I.
 CFLAGS = -O2 -Wall -Wno-unused-variable  -Wno-unused-result -I. -std=c99
 CC = gcc
 CXX = g++
-ifeq ($(OS),Windows_NT)
+SYS := $(shell gcc -dumpmachine)
+ifneq (, $(findstring linux, $(SYS)))
+    # Linux
+    CFLAGS += -Wno-unused-but-set-variable
+else ifneq(, $(findstring cygwin, $(SYS)))
+    # Cygwin
+    CFLAGS += -Wno-unused-but-set-variable -DUSE_FILE32API
+    LIBS += -liconv
+else ifneq(, $(findstring darwin, $(SYS)))
+    # OS X
+    LIBS += -liconv
+else
     #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 +=
-        LIBS += -liconv
-    else
-        # Linux
-        CFLAGS += -Wno-unused-but-set-variable
-        LIBS +=
-    endif
+    LIBS += -static-libgcc
 endif
 
 main: $(OBJS)
-	$(CXX) -o $(OUTPUT) $(LIBS) $(OBJS)
+	$(CXX) -o $(OUTPUT) $(OBJS) $(LIBS)
 
 clean:
 	rm -rf $(OUTPUT) $(OBJS)
diff --git a/ctrtool/oschar.c b/ctrtool/oschar.c
index f850ef3..b712ff2 100644
--- a/ctrtool/oschar.c
+++ b/ctrtool/oschar.c
@@ -1,6 +1,8 @@
 #include <stdlib.h>
 #ifndef _WIN32
+#ifndef __CYGWIN__
 #define LIBICONV_PLUG
+#endif
 #include <iconv.h>
 #endif
 #include "oschar.h"
diff --git a/ctrtool/utils.h b/ctrtool/utils.h
index 990d900..eb68fcb 100644
--- a/ctrtool/utils.h
+++ b/ctrtool/utils.h
@@ -46,7 +46,7 @@ inline int fseeko64(FILE *__stream, long long __off, int __whence)
 {
 	return _fseeki64(__stream, __off, __whence);
 }
-#elif __APPLE__
+#elif __APPLE__ || __CYGWIN__
     #define fseeko64 fseek // OS X file I/O is 64bit
 #elif __linux__
     extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence);
diff --git a/makerom/Makefile b/makerom/Makefile
index fd0832f..f7ae626 100644
--- a/makerom/Makefile
+++ b/makerom/Makefile
@@ -5,22 +5,24 @@ OBJS = $(foreach dir,$(SRC_DIR),$(subst .c,.o,$(wildcard $(dir)/*.c)))
 # Compiler Settings
 CFLAGS = --std=gnu99 -O2 -Wall -Wno-unused-value -Wno-unused-result -I.
 CC = gcc
-ifeq ($(OS),Windows_NT)
+
+SYS := $(shell gcc -dumpmachine)
+ifneq (, $(findstring linux, $(SYS)))
+    # Linux
+    CFLAGS += -Wno-unused-but-set-variable
+else ifneq(, $(findstring cygwin, $(SYS)))
+    # Cygwin
+    CFLAGS += -Wno-unused-but-set-variable
+    LIBS += -liconv
+else ifneq(, $(findstring darwin, $(SYS)))
+    # OS X
+    LIBS += -liconv
+else
     #Windows Build CFG
     CFLAGS += -Wno-unused-but-set-variable
     LIBS += -static-libgcc
-else
-    UNAME_S := $(shell uname -s)
-    ifeq ($(UNAME_S),Darwin)
-        # OS X
-        LIBS += -liconv
-    else
-        # Linux
-        CFLAGS += -Wno-unused-but-set-variable
-    endif
 endif
 
-
 # MAKEROM Build Settings
 OUTPUT = makerom
 
@@ -29,7 +31,7 @@ main: build
 rebuild: clean build
 
 build: $(OBJS)
-	$(CC) -o $(OUTPUT) $(LIBS) $(OBJS)
+	$(CC) -o $(OUTPUT) $(OBJS) $(LIBS)
 
 clean:
 	rm -rf $(OUTPUT) $(OBJS)
\ No newline at end of file
diff --git a/makerom/oschar.c b/makerom/oschar.c
index f850ef3..b712ff2 100644
--- a/makerom/oschar.c
+++ b/makerom/oschar.c
@@ -1,6 +1,8 @@
 #include <stdlib.h>
 #ifndef _WIN32
+#ifndef __CYGWIN__
 #define LIBICONV_PLUG
+#endif
 #include <iconv.h>
 #endif
 #include "oschar.h"