--- a/rc/bashrc	Thu Oct 19 05:51:50 2023 +0900
+++ b/rc/bashrc	Thu Oct 19 05:52:05 2023 +0900
@@ -30,7 +30,6 @@
 export PATH="/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/games"
 
 _os="$(uname -s)"
-_os_r="$(uname -r)"
 
 # pkgsrc
 if test -d /usr/pkg; then
@@ -286,15 +285,7 @@
 if command -v tmux > /dev/null 2>&1; then
   case "${_os}" in
   OpenBSD)
-    case "${_os_r}" in
-    6.[5-9]|[7-9].[0-9]|[1-9][0-9][0-9]*.[0-9])
       _tmux_conf_ver=2.9
-    ;;
-    *)
-      # probably not accurate enough but I don't want to dig through all the previous versions.
-      _tmux_conf_ver=2.2
-    ;;
-    esac
   ;;
   *)
     case "$(tmux -V 2> /dev/null)" in
@@ -311,7 +302,6 @@
 fi
 
 unset _os
-unset _os_r
 unset _uid
 unset i