build: add a note to remember why setproctitle may not work

On libbsd < 0.5, this is only a stub function. So, it is expected to do
nothing on OS like Ubuntu Precise.

diff --git a/configure.ac b/configure.ac
index d7c6bcd1f22947ef0d7e4d7629c89f9107c08744..ee8e54f228c40a8a3c6e80cd50b8ef8ba3fff9c5 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -128,7 +128,7 @@ AC_CONFIG_LIBOBJ_DIR([src/compat])
 AC_FUNC_MALLOC
 AC_FUNC_REALLOC
 AC_FUNC_FORK
-# setproctitle (maybe through libbsd)
+# setproctitle (maybe through libbsd [until 0.5, it is only a stub function])
 AC_SEARCH_LIBS([setproctitle], [util bsd])
 AC_REPLACE_FUNCS([setproctitle])
 AC_CHECK_FUNCS([setproctitle_init])