--- configure.ac.orig	2009-02-25 11:51:29 +0100
+++ configure.ac.orig	2009-02-25 11:55:47 +0100
@@ -348,7 +348,7 @@ 
  # Solaris stuff
  AC_SEARCH_LIBS([inet_ntop],[nsl])
  AC_SEARCH_LIBS([recv],[socket])
- AC_CHECK_DECL([CMSG_SPACE],,CFLAGS="$CFLAGS -D_XOPEN_SOURCE=500 -D__EXTENSIONS__")
+ AC_CHECK_DECL([CMSG_SPACE],,CFLAGS="$CFLAGS -D_XOPEN_SOURCE=500 -D__EXTENSIONS__", [[#include <sys/socket.h>]])
 
 # Checks for library functions.
 AC_FUNC_MEMCMP