wget https://raw.githubusercontent.com/Homebrew/formula-patches/e2cc7c1/clisp/patch-src_lispbibl_d.diff
echo 'Creating brew-patch.diff'
cat << EOF >> brew-patch.diff
diff --git a/src/stream.d b/src/stream.d
index 5345ed6..cf14e29 100644
--- a/src/stream.d
+++ b/src/stream.d
@@ -3994,7 +3994,7 @@ global object iconv_range (object encoding, uintL start, uintL end, uintL maxint
 nonreturning_function(extern, error_unencodable, (object encoding, chart ch));

 /* Avoid annoying warning caused by a wrongly standardized iconv() prototype. */
-#ifdef GNU_LIBICONV
+#if defined(GNU_LIBICONV) && !defined(__APPLE_CC__)
   #undef iconv
   #define iconv(cd,inbuf,inbytesleft,outbuf,outbytesleft) \
     libiconv(cd,(ICONV_CONST char **)(inbuf),inbytesleft,outbuf,outbytesleft)
EOF