--- configure.ac.orig 2010-08-09 15:24:50.000000000 -0500
+++ configure.ac 2013-01-06 10:39:42.000000000 -0600
dnl #########################################################################
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS([config.h])
AM_INIT_AUTOMAKE([libesmtp],[1.0.6])
AC_CONFIG_MACRO_DIR([m4])
dnl #########################################################################
AC_REPLACE_FUNCS(strdup strcasecmp strncasecmp memrchr)
-AC_CHECK_FUNCS(strtol uname gethostname gettimeofday)
+AC_CHECK_FUNCS(strtol uname gethostname gettimeofday snprintf vsnprintf)
AC_SEARCH_LIBS(socket, socket)
dnl Conditional check for functions needed in threaded code