nginx 0.1.9 *) Bugfix: the proxied request was sent without arguments if the request contains "//", "/./", "/../" or "%XX". *) Bugfix: the large compressed responses may be transferred not completely. *) Bugfix: the files bigger than 2G was not transferred on Linux that does not support sendfile64(). *) Bugfix: while the build configuration on Linux the --with-poll_module parameter was required; bug appeared in 0.1.8.

--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1828,7 +1828,7 @@ static char *ngx_http_lowat_check(ngx_co
         return NGX_CONF_ERROR;
     }
 
-#elif !(HAVE_SO_SNDLOWAT)
+#elif !(NGX_HAVE_SO_SNDLOWAT)
 
     ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                        "\"send_lowat\" is not supported, ignored");