--- a/configure.ac
+++ b/configure.ac
@@ -18,8 +18,6 @@
 # like it [e.g., 1]. But, it seems nuts to me to just warn on bad options.
 #
 # [1]: https://lists.gnu.org/archive/html/autoconf/2024-09/msg00000.html
-AS_IF([test -n "$ac_unrecognized_opts"],
-      [AC_MSG_ERROR([unrecognized option(s); aborting])])
 
 AC_PREREQ([2.69])
 AC_CONFIG_SRCDIR([bin/ch-run.c])
