+dnl ---------------------------------------------------------------------------
+dnl support for image formats that do not rely on external library
+dnl ---------------------------------------------------------------------------
+
+WX_ARG_ENABLE(gif, [ --enable-gif use gif images (GIF file format)], wxUSE_GIF)
+WX_ARG_ENABLE(pcx, [ --enable-pcx use pcx images (PCX file format)], wxUSE_PCX)
+WX_ARG_ENABLE(pnm, [ --enable-pnm use pnm images (PNM file format)], wxUSE_PNM)
+