diff --git a/README.md b/README.md
index 4e98e11..6b1547c 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ docker run -it --rm chronolaw/cpp_study
 
 * [Bjarne Stroustrup's FAQ](http://www.stroustrup.com/bs_faq.html)
 * [Bjarne Stroustrup's C++11 FAQ](http://www.stroustrup.com/C++11FAQ.html)
+* [Bjarne Stroustrup's C++ HOPL4 (zh-cn)](https://github.com/Cpp-Club/Cxx_HOPL4_zh)
 * [C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines)
 * [OpenResty Code Style Guide(zh-cn)](http://openresty.org/cn/c-coding-style-guide.html)
 * [Google Code Style Guide](https://google.github.io/styleguide/cppguide.html)
diff --git a/section1/oop.cpp b/section1/oop.cpp
index 80b8267..9ad4968 100644
--- a/section1/oop.cpp
+++ b/section1/oop.cpp
@@ -9,6 +9,10 @@
 #include <vector>
 #include <set>
 
+#if(defined (__MINGW64__) || (defined __MINGW32__))
+#include <cstdint>
+#endif
+
 #if 1
 
 class Interface {};
diff --git a/section1/preprocess.cpp b/section1/preprocess.cpp
index bbf19f3..20c6c35 100644
--- a/section1/preprocess.cpp
+++ b/section1/preprocess.cpp
@@ -26,6 +26,8 @@ void case1()
 #
 #if __linux__
 #   define HAS_LINUX    1
+#else
+#   define HAS_LINUX    0
 #endif
 #
     cout << "linux is " << HAS_LINUX << endl;