diff --git a/runtime/compiler/irix5_cpp.vim b/runtime/compiler/irix5_cpp.vim
index 0112dc1..85ab8c6 100644
--- a/runtime/compiler/irix5_cpp.vim
+++ b/runtime/compiler/irix5_cpp.vim
@@ -2,6 +2,7 @@
 " Compiler:	SGI IRIX 5.3 CC or NCC
 " Maintainer:	David Harrison <david_jr@users.sourceforge.net>
 " Last Change:	2012 Apr 30
+"		2024 Apr 03 by The Vim Project (removed :CompilerSet definition)
 
 if exists("current_compiler")
   finish
@@ -10,10 +11,6 @@
 let s:keepcpo= &cpo
 set cpo&vim
 
-if exists(":CompilerSet") != 2		" older Vim always used :setlocal
-  command -nargs=* CompilerSet setlocal <args>
-endif
-
 CompilerSet errorformat=%E\"%f\"\\,\ line\ %l:\ error(%n):\ ,
 		    \%E\"%f\"\\,\ line\ %l:\ error(%n):\ %m,
 		    \%W\"%f\"\\,\ line\ %l:\ warning(%n):\ %m,