diff --git a/include/dll.hpp b/include/dll.hpp
deleted file mode 100644
index 7280225..0000000
--- a/include/dll.hpp
+++ /dev/null
@@ -1,24 +0,0 @@
-#if defined _WIN32 || defined __CYGWIN__
-  #ifdef BUILDING_DLL
-    #ifdef __GNUC__
-      #define DLL_PUBLIC __attribute__ ((dllexport))
-    #else
-      #define DLL_PUBLIC __declspec(dllexport) // Note: actually gcc seems to also supports this syntax.
-    #endif
-  #else
-    #ifdef __GNUC__
-      #define DLL_PUBLIC __attribute__ ((dllimport))
-    #else
-      #define DLL_PUBLIC __declspec(dllimport) // Note: actually gcc seems to also supports this syntax.
-    #endif
-  #endif
-  #define DLL_LOCAL
-#else
-  #if __GNUC__ >= 4
-    #define DLL_PUBLIC __attribute__ ((visibility ("default")))
-    #define DLL_LOCAL  __attribute__ ((visibility ("hidden")))
-  #else
-    #define DLL_PUBLIC
-    #define DLL_LOCAL
-  #endif
-#endif