Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt	(revision 7222)
+++ CMakeLists.txt	(working copy)
@@ -1199,6 +1199,11 @@
     endif()
 endif()
 
+# Add Preprocessor Definitions /D OPENEXR_DLL
+if(MSVC)
+    set(EXTRA_C_FLAGS "${EXTRA_C_FLAGS} /D OPENEXR_DLL")
+endif()
+
 # Extra link libs if the user selects building static libs:
 if(NOT BUILD_SHARED_LIBS AND CMAKE_COMPILER_IS_GNUCXX AND NOT ANDROID)
     # Android does not need these settings because they are already set by toolchain file