Use the full option name

alerque · alerque · commit f589e21472e6 · 2021-02-14T19:15:05.000+03:00
diff --git a/plugin/vimux.vim b/plugin/vimux.vim
@@ -1,4 +1,4 @@
-if exists('g:loaded_vimux') || &cp
+if exists('g:loaded_vimux') || &compatible
   finish
 endif
 let g:loaded_vimux = 1

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-if exists('g:loaded_vimux') \|\| &cp`
	`1`	`+if exists('g:loaded_vimux') \|\| &compatible`
`2`	`2`	`finish`
`3`	`3`	`endif`
`4`	`4`	`let g:loaded_vimux = 1`