+# --with-librdkafka {{{
+AC_ARG_WITH(librdkafka, [AS_HELP_STRING([--with-librdkafka@<:@=PREFIX@:>@], [Path to librdkafka.])],
+[
+ if test "x$withval" = "xno" && test "x$withval" != "xyes"
+ then
+ with_librdkafka_cppflags="-I$withval/include"
+ with_librdkafka_ldflags="-L$withval/lib"
+ with_librdkafka="yes"
+ else
+ with_librdkafka="$withval"
+ fi
+],
+[
+ with_librdkafka="yes"
+])
+SAVE_CPPFLAGS="$CPPFLAGS"
+SAVE_LDFLAGS="$LDFLAGS"
+
+if test "x$with_librdkafka" = "xyes"
+then
+ AC_CHECK_HEADERS(librdkafka/rdkafka.h, [with_librdkafka="yes"], [with_librdkafka="no (librdkafka/rdkafka.h not found)"])
+fi
+
+if test "x$with_librdkafka" = "xyes"
+then
+ AC_CHECK_LIB(rdkafka, rd_kafka_new, [with_librdkafka="yes"], [with_librdkafka="no (Symbol 'rd_kafka_new' not found)"])
+ AC_CHECK_LIB(rdkafka, rd_kafka_conf_set_log_cb, [with_librdkafka_log_cb="yes"], [with_librdkafka_log_cb="no"])
+ AC_CHECK_LIB(rdkafka, rd_kafka_conf_set_logger, [with_librdkafka_logger="yes"], [with_librdkafka_logger="no"])
+fi
+if test "x$with_librdkafka" = "xyes"
+then
+ BUILD_WITH_LIBRDKAFKA_CPPFLAGS="$with_librdkafka_cppflags"
+ BUILD_WITH_LIBRDKAFKA_LDFLAGS="$with_librdkafka_ldflags"
+ BUILD_WITH_LIBRDKAFKA_LIBS="-lrdkafka"
+ AC_SUBST(BUILD_WITH_LIBRDKAFKA_CPPFLAGS)
+ AC_SUBST(BUILD_WITH_LIBRDKAFKA_LDFLAGS)
+ AC_SUBST(BUILD_WITH_LIBRDKAFKA_LIBS)
+ AC_DEFINE(HAVE_LIBRDKAFKA, 1, [Define if librdkafka is present and usable.])
+ if test "x$with_librdkafka_log_cb" = "xyes"
+ then
+ AC_DEFINE(HAVE_LIBRDKAFKA_LOG_CB, 1, [Define if librdkafka log facility is present and usable.])
+ fi
+ if test "x$with_librdkafka_logger" = "xyes"
+ then
+ AC_DEFINE(HAVE_LIBRDKAFKA_LOGGER, 1, [Define if librdkafka log facility is present and usable.])
+ fi
+fi
+CPPFLAGS="$SAVE_CPPFLAGS"
+LDFLAGS="$SAVE_LDFLAGS"
+AM_CONDITIONAL(BUILD_WITH_LIBRDKAFKA, test "x$with_librdkafka" = "xyes")
+
+# }}}
+