--- configure.ac
+++ configure.ac	2013-01-23 12:57:44.605952352 +0000
@@ -107,6 +107,7 @@ AC_TYPE_UINT32_T
 AC_TYPE_INT32_T
 AC_TYPE_UINT64_T
 AC_TYPE_INT64_T
+AC_CHECK_SIZEOF(long long)
 AC_FUNC_MMAP
 AC_FUNC_FORK
 AC_FUNC_MBRTOWC