# endif
#endif /* wxUSE_PROTOCOL */
+#if wxUSE_GZSTREAM
+# if !wxUSE_ZLIB
+# ifdef wxABORT_ON_CONFIG_ERROR
+# error "wxUSE_GZSTREAM requires wxUSE_ZLIB"
+# else
+# undef wxUSE_ZLIB
+# define wxUSE_ZLIB 1
+# endif
+# endif
+#endif /* wxUSE_GZSTREAM */
+
/* have to test for wxUSE_HTML before wxUSE_FILESYSTEM */
#if wxUSE_HTML
# if !wxUSE_FILESYSTEM