diff -Naur bc-3.2.5.orig/configure bc-3.2.5/configure
--- bc-3.2.5.orig/configure.sh	2021-01-30 19:35:41.000000000 -0500
+++ bc-3.2.5/configure.sh	2021-02-02 11:45:45.393574823 -0500
@@ -609,7 +609,6 @@
 				help* | bc-only* | dc-only* | coverage* | debug*)
 					usage "No arg allowed for --$arg option" ;;
 				disable-bc* | disable-dc* | disable-clean*)
-				disable-extra-math*)
 					usage "No arg allowed for --$arg option" ;;
 				disable-generated-tests* | disable-history*)
 					usage "No arg allowed for --$arg option" ;;