@@ -784,10 +784,13 @@
 		;;
 	*)
 		AC_CHECK_FUNCS(dladdr)
 		;;
 esac
+
+AC_CHECK_HEADERS(sys/mman.h)
+AC_CHECK_FUNCS(mmap mlock)
 
 AC_ARG_ENABLE(threads,
 	AS_HELP_STRING([--disable-threads], [disable thread support]))
 AS_IF([test x"$enable_threads" != x"no"], [
 	AC_MSG_CHECKING(for threads)