Index: tntnet-2.0/configure.in
===================================================================
--- tntnet-2.0.orig/configure.in	2011-08-08 15:14:54.795253509 +0300
+++ tntnet-2.0/configure.in	2011-08-08 15:15:08.759253466 +0300
@@ -172,9 +172,9 @@
 AC_CHECK_FUNCS([setenv])
 
 AC_COMPILE_IFELSE(
-  [#include <cxxtools/net/tcpserver.h>
+  [AC_LANG_SOURCE([#include <cxxtools/net/tcpserver.h>
    cxxtools::net::TcpServer s;
-   int f = s.getFd();],
+   int f = s.getFd();])],
   AC_DEFINE(HAVE_CXXTOOLS_TCPSERVER_GETFD, , [defined if cxxtools::TcpServer has getFd method]))
 
 case "${host_cpu}-${host_os}" in
