#define wxUSE_ZIPSTREAM 1
// Set to 1 to compile wxZlibInput/OutputStream classes. Also required by
-// wxUSE_LIBPNG.
-#define wxUSE_ZLIB 1
+// wxUSE_LIBPNG and wxUSE_GZSTREAM.
+#define wxUSE_ZLIB 1
+
+// Set to 1 to compile wxGzipInput/OutputStream classes. Requires wxUSE_ZLIB.
+#define wxUSE_GZSTREAM 1
// Set to 1 to enable virtual Internet filesystem (requires wxUSE_FILESYSTEM)
#define wxUSE_FS_INET 1