diff --git a/.travis.yml b/.travis.yml
index 87e777a..70f7679 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -31,6 +31,17 @@ matrix:
   - addons: *1
     compiler: clang
     env: COMPILER_VERSION=3.9 BUILD_TYPE=Debug CFLAGS="-O0" CXXFLAGS="-O0"
+  - addons: &3
+      apt:
+        sources:
+        - ubuntu-toolchain-r-test
+        packages:
+        - g++-4.8
+    compiler: gcc
+    env: COMPILER_VERSION=4.8 BUILD_TYPE=Debug
+  - addons: *3
+    compiler: gcc
+    env: COMPILER_VERSION=4.8 BUILD_TYPE=Release
 
 before_install:
   - ./.travis-before-install.sh
diff --git a/README.md b/README.md
index 1a4c33c..7b32797 100644
--- a/README.md
+++ b/README.md
@@ -75,9 +75,10 @@ In extension(`ExtensionMap`), JSON number value is parsed as int or float(number
 * GLTF loader plugin for OGRE 2.1. Support for PBR materials via HLMS/PBS https://github.com/Ybalrid/Ogre_glTF
 * [TinyGltfImporter](http://doc.magnum.graphics/magnum/classMagnum_1_1Trade_1_1TinyGltfImporter.html) plugin for [Magnum](https://github.com/mosra/magnum), a lightweight and modular C++11/C++14 graphics middleware for games and data visualization.
 * [Diligent Engine](https://github.com/DiligentGraphics/DiligentEngine) - A modern cross-platform low-level graphics library and rendering framework
-* Lighthouse 2: a rendering framework for real-time ray tracing / path tracing experiments. https://github.com/jbikker/lighthouse2 
+* Lighthouse 2: a rendering framework for real-time ray tracing / path tracing experiments. https://github.com/jbikker/lighthouse2
 * [QuickLook GLTF](https://github.com/toshiks/glTF-quicklook) - quicklook plugin for macos. Also SceneKit wrapper for tinygltf.
 * [GlslViewer](https://github.com/patriciogonzalezvivo/glslViewer) - live GLSL coding for MacOS and Linux
+* [Vulkan-Samples](https://github.com/KhronosGroup/Vulkan-Samples) - The Vulkan Samples is collection of resources to help you develop optimized Vulkan applications.
 * Your projects here! (Please send PR)
 
 ## TODOs
diff --git a/tiny_gltf.h b/tiny_gltf.h
index 67ef7e1..cc09e77 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -1415,6 +1415,7 @@ class TinyGLTF {
 #include <algorithm>
 //#include <cassert>
 #ifndef TINYGLTF_NO_FS
+#include <cstdio>
 #include <fstream>
 #endif
 #include <sstream>
@@ -1541,6 +1542,13 @@ class TinyGLTF {
 #undef NOMINMAX
 #endif
 
+#if defined(__GLIBCXX__) // mingw
+
+#include <ext/stdio_filebuf.h>	// fstream (all sorts of IO stuff) + stdio_filebuf (=streambuf)
+#include <fcntl.h>	// _O_RDONLY
+
+#endif
+
 #elif !defined(__ANDROID__)
 #include <wordexp.h>
 #endif
@@ -2392,11 +2400,20 @@ bool FileExists(const std::string &abs_filename, void *) {
   }
 #else
 #ifdef _WIN32
-  FILE *fp;
+#if defined(_MSC_VER) || defined(__GLIBCXX__)
+  FILE *fp = nullptr;
   errno_t err = _wfopen_s(&fp, UTF8ToWchar(abs_filename).c_str(), L"rb");
   if (err != 0) {
     return false;
   }
+#else
+  FILE *fp = nullptr;
+  errno_t err = fopen_s(&fp, abs_filename.c_str(), "rb");
+  if (err != 0) {
+    return false;
+  }
+#endif
+
 #else
   FILE *fp = fopen(abs_filename.c_str(), "rb");
 #endif
@@ -2489,7 +2506,15 @@ bool ReadWholeFile(std::vector<unsigned char> *out, std::string *err,
   }
 #else
 #ifdef _WIN32
+#if defined(__GLIBCXX__) // mingw
+  int file_descriptor = _wopen(UTF8ToWchar(filepath).c_str(), _O_RDONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
+  std::istream f(&wfile_buf);
+#elif defined(_MSC_VER)
   std::ifstream f(UTF8ToWchar(filepath).c_str(), std::ifstream::binary);
+#else // clang?
+  std::ifstream f(filepath.c_str(), std::ifstream::binary);
+#endif
 #else
   std::ifstream f(filepath.c_str(), std::ifstream::binary);
 #endif
@@ -2520,7 +2545,6 @@ bool ReadWholeFile(std::vector<unsigned char> *out, std::string *err,
   out->resize(sz);
   f.read(reinterpret_cast<char *>(&out->at(0)),
          static_cast<std::streamsize>(sz));
-  f.close();
 
   return true;
 #endif
@@ -2529,7 +2553,15 @@ bool ReadWholeFile(std::vector<unsigned char> *out, std::string *err,
 bool WriteWholeFile(std::string *err, const std::string &filepath,
                     const std::vector<unsigned char> &contents, void *) {
 #ifdef _WIN32
+#if defined(__GLIBCXX__) // mingw
+  int file_descriptor = _wopen(UTF8ToWchar(filepath).c_str(), _O_WRONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
+  std::ostream f(&wfile_buf);
+#elif defined(_MSC_VER)
   std::ofstream f(UTF8ToWchar(filepath).c_str(), std::ofstream::binary);
+#else // clang?
+  std::ofstream f(filepath.c_str(), std::ofstream::binary);
+#endif
 #else
   std::ofstream f(filepath.c_str(), std::ofstream::binary);
 #endif
@@ -2549,7 +2581,6 @@ bool WriteWholeFile(std::string *err, const std::string &filepath,
     return false;
   }
 
-  f.close();
   return true;
 }
 
@@ -6250,14 +6281,24 @@ static void SerializeGltfBufferData(const std::vector<unsigned char> &data,
 static bool SerializeGltfBufferData(const std::vector<unsigned char> &data,
                                     const std::string &binFilename) {
 #ifdef _WIN32
+#if defined(__GLIBCXX__) // mingw
+ int file_descriptor = _wopen(UTF8ToWchar(binFilename).c_str(), _O_WRONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
+  std::ostream output(&wfile_buf);
+  if (!wfile_buf.is_open()) return false;
+#elif defined(_MSC_VER)
   std::ofstream output(UTF8ToWchar(binFilename).c_str(), std::ofstream::binary);
+  if (!output.is_open()) return false;
 #else
   std::ofstream output(binFilename.c_str(), std::ofstream::binary);
-#endif
   if (!output.is_open()) return false;
+#endif
+#else
+  std::ofstream output(binFilename.c_str(), std::ofstream::binary);
+  if (!output.is_open()) return false;
+#endif
   output.write(reinterpret_cast<const char *>(&data[0]),
                std::streamsize(data.size()));
-  output.close();
   return true;
 }
 
@@ -6618,7 +6659,8 @@ static void SerializeGltfMaterial(Material &material, json &o) {
     SerializeStringProperty("alphaMode", material.alphaMode, o);
   }
 
-  JsonAddMember(o, "doubleSided", json(material.doubleSided));
+  if(material.doubleSided != false)
+	JsonAddMember(o, "doubleSided", json(material.doubleSided));
 
   if (material.normalTexture.index > -1) {
     json texinfo;
@@ -7112,11 +7154,21 @@ static bool WriteGltfStream(std::ostream &stream, const std::string &content) {
 static bool WriteGltfFile(const std::string &output,
                           const std::string &content) {
 #ifdef _WIN32
+#if defined(_MSC_VER)
   std::ofstream gltfFile(UTF8ToWchar(output).c_str());
+#elif defined(__GLIBCXX__)
+  int file_descriptor = _wopen(UTF8ToWchar(output).c_str(), _O_WRONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
+  std::ostream gltfFile(&wfile_buf);
+  if (!wfile_buf.is_open()) return false;
 #else
   std::ofstream gltfFile(output.c_str());
-#endif
   if (!gltfFile.is_open()) return false;
+#endif
+#else
+  std::ofstream gltfFile(output.c_str());
+  if (!gltfFile.is_open()) return false;
+#endif
   return WriteGltfStream(gltfFile, content);
 }
 
@@ -7167,7 +7219,15 @@ static void WriteBinaryGltfStream(std::ostream &stream,
 static void WriteBinaryGltfFile(const std::string &output,
                                 const std::string &content) {
 #ifdef _WIN32
+#if defined(_MSC_VER)
   std::ofstream gltfFile(UTF8ToWchar(output).c_str(), std::ios::binary);
+#elif defined(__GLIBCXX__)
+  int file_descriptor = _wopen(UTF8ToWchar(output).c_str(), _O_WRONLY | _O_BINARY);
+  __gnu_cxx::stdio_filebuf<char> wfile_buf(file_descriptor, std::ios_base::in);
+  std::ostream gltfFile(&wfile_buf);
+#else
+  std::ofstream gltfFile(output.c_str(), std::ios::binary);
+#endif
 #else
   std::ofstream gltfFile(output.c_str(), std::ios::binary);
 #endif