disable the --read-functions option in korn shells

which.spec

@@ -1,7 +1,7 @@
 Summary: Displays where a particular program in your path is located
 Name: which
 Version: 2.21
-Release: 29%{?dist}
+Release: 30%{?dist}
 License: GPLv3
 Source0: http://ftp.gnu.org/gnu/which/%{name}-%{version}.tar.gz
 Source1: which2.sh
@@ -41,6 +41,9 @@ rm -f $RPM_BUILD_ROOT%{_infodir}/dir
 %{_mandir}/man1/which.1*
 
 %changelog
+* Tue Oct 26 2021 Than Ngo <than@redhat.com> - 2.21-30
+- disable the --read-functions option in korn shells
+
 * Fri Oct 15 2021 Than Ngo <than@redhat.com> - 2.21-29
 - Fixed regression, use export instead alias
 

which2.sh

@@ -3,7 +3,7 @@
 
 case "$(cat /proc/$$/comm)" in
 ksh|mksh)
-    which_declare="typeset -fS"
+    which_declare=""
     which_opt=""
     ;;
 zsh)