diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3bf7f55f81..d9bbff0d45 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -209,7 +209,7 @@ endmacro()
 # Enabling all warnings in MSVC spams too much
 if(NOT MSVC)
 	add_definitions(-Wall)
-
+	add_definitions(-D_DEFAULT_SOURCE)
 	# TODO: would like these but they produce overwhelming amounts of warnings
 	#check_and_add_flag(EXTRA -Wextra)
 	#check_and_add_flag(MISSING_FIELD_INITIALIZERS -Wmissing-field-initializers)
diff --git a/Source/Core/Common/ChunkFile.h b/Source/Core/Common/ChunkFile.h
index 0f177e6761..67066dd206 100644
--- a/Source/Core/Common/ChunkFile.h
+++ b/Source/Core/Common/ChunkFile.h
@@ -32,7 +32,12 @@
 #include "Common/Logging/Log.h"
 
 // ewww
-#if _LIBCPP_VERSION || __GNUC__ >= 5
+
+#ifndef __has_feature
+ #define __has_feature(x) (0)
+#endif
+
+#if (__has_feature(is_trivially_copyable) && (defined(_LIBCPP_VERSION) || defined(__GLIBCXX__))) || (defined(__GNUC__) && __GNUC__ >= 5)
 #define IsTriviallyCopyable(T) std::is_trivially_copyable<typename std::remove_volatile<T>::type>::value
 #elif __GNUC__
 #define IsTriviallyCopyable(T) std::has_trivial_copy_constructor<T>::value