@@ -98,10 +98,12 @@
 		ac_cv_have_ipv6="no",
 		ac_cv_have_ipv6="no")])
 AC_MSG_RESULT($ac_cv_have_ipv6)
 test x"$ac_cv_have_ipv6" = x"yes" && \
 	AC_DEFINE(HAVE_IPV6, 1, "Whether we have IPv6 support")
+
+AC_CHECK_HEADERS(sys/mman.h)
 
 test x"$GCC" = x"yes" && CFLAGS="$CFLAGS -Werror -pipe -g"
 test x"$GCC" = x"yes" && OBJCFLAGS="$OBJCFLAGS -Werror -pipe -g"
 
 if test x"$cross_compiling" = x"yes"; then