--- src/libical/CMakeLists.txt	Sat Sep 26 21:38:51 2009
+++ src/libical/CMakeLists.txt	Fri Oct 30 14:01:12 2009
@@ -7,6 +7,13 @@
   ${CMAKE_BINARY_DIR}/src/libical
 )
 
+if(WIN32)
+  if(MSVC)
+    add_definitions(-DBUILD_LIBICALDLL)
+  endif(MSVC)
+endif(WIN32)
+
+
 set(PACKAGE_DATA_DIR "\\\"${CMAKE_INSTALL_PREFIX}/share/libical\\\"")
 add_definitions(-DPACKAGE_DATA_DIR=${PACKAGE_DATA_DIR})
 
--- src/libical/icalerror.h	Sat Sep 26 21:38:51 2009
+++ src/libical/icalerror.h	Fri Oct 30 14:00:11 2009
@@ -69,7 +69,17 @@
  *  @warning NOT THREAD SAFE -- recommended that you do not change
  *           this in a multithreaded program.
  */
-extern int icalerror_errors_are_fatal;
+#ifdef _MSC_VER
+  #ifdef BUILD_LIBICALDLL
+    #define LIBICAL_EXPORT __declspec(dllexport)
+  #else
+    #define LIBICAL_EXPORT __declspec(dllimport)
+  #endif
+#else
+  #define LIBICAL_EXPORT extern
+#endif
+
+LIBICAL_EXPORT int icalerror_errors_are_fatal;
 
 /* Warning messages */