diff --git a/Win32-extras.cabal b/Win32-extras.cabal
--- a/Win32-extras.cabal
+++ b/Win32-extras.cabal
@@ -1,5 +1,5 @@
 name:                Win32-extras
-version:             0.2.0.0
+version:             0.2.0.1
 synopsis:            Provides missing Win32 API
 description:         This package provides missing features of Win32 package.
                      .
@@ -60,5 +60,6 @@
   extra-libraries: msimg32, imm32
   ghc-options    : -Wall
   include-dirs:  include
-  includes:      alphablend.h
+  -- "cabal sdist" command doesn't contain includes file in tarball.
+  install-includes: alphablend.h
   c-sources:     cbits/alphablend.c
diff --git a/include/alphablend.h b/include/alphablend.h
new file mode 100644
--- /dev/null
+++ b/include/alphablend.h
@@ -0,0 +1,10 @@
+#ifndef _ALPHABLEND_H
+#define _ALPHABLEND_H
+#define WINVER 0x0500
+#include <windows.h>
+
+BOOL c_AlphaBlend ( HDC hdcDest, int nXOriginDest, int nYOriginDest, int nWidthDest, int hHeightDest
+                  , HDC hdcSrc, int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc
+                  , PBLENDFUNCTION pblendFunction);
+
+#endif /* _ALPHABLEND_H */