--- a/configure.ac	2020-12-18 22:18:04.000000000 +0000
+++ b/configure.ac	2021-01-17 05:55:10.946679960 +0000
@@ -49,7 +49,7 @@
 program_prefix="${save_program_prefix}"
 
 AM_INIT_AUTOMAKE([1.11])
-AC_PREREQ(2.63)
+AC_PREREQ([2.64])
 AC_CONFIG_SRCDIR([include/grub/dl.h])
 AC_CONFIG_HEADER([config-util.h])