configure.ac: Fix the bug report for unexpected CPU or ABI.

diff --git a/configure.ac b/configure.ac
index a415d05..b6c40ba 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -145,7 +145,7 @@ m4_define([catacomb_DEFINE_CPU_OR_ABI],
        ;;m4_define([catacomb_seen_$3/$$2], [t])])])
   catacomb_CPU_FAMILIES([_def])
   nil) ;;
-  *) AC_MSG_ERROR([BUG: unexpected $1 \`$1']) ;;
+  *) AC_MSG_ERROR([BUG: unexpected $1 \`$$1']) ;;
 esac])
 
 dnl Now that's out the way, we can explain what we're doing.