diff --git a/runtime/compiler/irix5_c.vim b/runtime/compiler/irix5_c.vim
index f440e74..f70bfb1 100644
--- a/runtime/compiler/irix5_c.vim
+++ b/runtime/compiler/irix5_c.vim
@@ -2,6 +2,7 @@
 " Compiler:	SGI IRIX 5.3 cc
 " 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=\%Ecfe:\ Error:\ %f\\,\ line\ %l:\ %m,
 		     \%Wcfe:\ Warning:\ %n:\ %f\\,\ line\ %l:\ %m,
 		     \%Wcfe:\ Warning\ %n:\ %f\\,\ line\ %l:\ %m,