+dnl Stable or unstable version?
+AC_MSG_CHECKING([if this is a stable or unstable branch of libguestfs])
+AS_IF([test "$((libguestfs_minor % 2))" -eq 0 ],[
+ AC_MSG_RESULT([stable])
+ ],[
+ AC_MSG_RESULT([unstable])
+ AC_MSG_NOTICE([
+***
+This is a development version of libguestfs. Some APIs may be unstable
+until they appear in a stable release of libguestfs (at which point
+the C API and ABI is guaranteed to remain stable forever). For
+more information about stable and development branches of libguestfs
+please see the section "LIBGUESTFS VERSION NUMBERS" in guestfs(3).
+***])
+ ])
+