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;