diff -Naur oiio-Release-1.4.7.orig/src/dpx.imageio/libdpx/Writer.cpp oiio-Release-1.4.7/src/dpx.imageio/libdpx/Writer.cpp
--- oiio-Release-1.4.7.orig/src/dpx.imageio/libdpx/Writer.cpp	2014-05-19 15:20:32.000000000 -0500
+++ oiio-Release-1.4.7/src/dpx.imageio/libdpx/Writer.cpp	2014-05-20 07:04:17.940464785 -0500
@@ -140,7 +140,7 @@
 
 bool dpx::Writer::WriteUserData(void *data)
 {
-    long size = this->header.UserSize();
+    size_t size = this->header.UserSize();
 	if (fd->Write(data, size) != size)
 		return false;
     this->fileLoc += size;