+dnl
+dnl if test "$PHP_HTTP_LIBSERF_DIR" = "no"; then
+dnl AC_DEFINE([PHP_HTTP_HAVE_SERF], [0], [ ])
+dnl else
+dnl AC_MSG_CHECKING([for serf-?/serf.h])
+dnl SERF_DIR=
+dnl for i in "$PHP_HTTP_LIBSERF_DIR" /usr/local /usr /opt; do
+dnl if test -f "$i/include/serf-0/serf.h"; then
+dnl SERF_DIR=$i
+dnl SERF_VER=0
+dnl break
+dnl elif test -f "$i/include/serf-1/serf.h"; then
+dnl SERF_DIR=$i
+dnl SERF_VER=1
+dnl fi
+dnl done