--- a/configure
+++ b/configure
@@ -325,6 +325,7 @@ if test $backend = llvm; then
        check_version 17.0 $llvm_version ||
        check_version 18.1 $llvm_version ||
        check_version 19. $llvm_version ||
+       check_version 20. $llvm_version ||
        false; then
     echo "Debugging is enabled with llvm $llvm_version"
   else
