document --with-zlib

diff --git a/README b/README
index 411672aec21d17d70bb40ebb33b529697666308b..f5129473affccb9d9be93d7f986355576a3f2f23 100644 (file)
--- a/README
+++ b/README
@@ -395,6 +395,9 @@ Building
        If these are installed at a nonstandard prefix, use
        "--with-libxml2=/prefix" or "--with-libjson=/prefix".
 
+       To support compression on the HTTP statistics channel, the
+       server must be linked against libzlib (--with-zlib=/prefix).
+
        On some platforms it is necessary to explicitly request large
        file support to handle files bigger than 2GB.  This can be
        done by "--enable-largefile" on the configure command line.