Update fuzzer readme

Drop --enable-json flag and make it more obvious that clang needs
to be used.

diff --git a/sapi/fuzzer/README.md b/sapi/fuzzer/README.md
index c753c23c30214bb8de098c1e908e363674a59d01..0645a04bc71525b75f4cd77004eea7f3b928e866 100644 (file)
--- a/sapi/fuzzer/README.md
+++ b/sapi/fuzzer/README.md
@@ -4,12 +4,13 @@ Fuzzing SAPI for PHP
 The following `./configure` options can be used to enable the fuzzing SAPI, as well as all availablefuzzers. If you don't build the exif/json/mbstring extensions, fuzzers for these extensions will not be built.
 
 ```sh
+CC=clang CXX=clang++ \
 ./configure \
+    --disable-all \
     --enable-fuzzer \
     --with-pic \
     --enable-debug-assertions \
     --enable-exif \
-    --enable-json \
     --enable-mbstring
 ```