1 diff --git a/configure.ac b/configure.ac
2 index bd7b0ac16779..a5553a067a31 100644
7 AC_INIT(openchange, 2.3, [openchange@openchange.org])
8 AC_CONFIG_HEADER([config.h])
10 AC_DEFINE(_GNU_SOURCE, 1, [Use GNU extensions])
12 PKG_PROG_PKG_CONFIG([0.20])