// Set to 1 to compile wxZipInput/OutputStream classes.
#define wxUSE_ZIPSTREAM 1
+// Set to 1 to compile wxBackingFile and wxBackedInputStream
+#define wxUSE_BACKINGFILE 1
+
// Set to 1 to compile wxZlibInput/OutputStream classes. Also required by
// wxUSE_LIBPNG
#define wxUSE_ZLIB 1