https://git.ruby-lang.org/ruby.git/commit/?id=e59f3054c3

From e59f3054c308fc657224d2dde8d100816b82de84 Mon Sep 17 00:00:00 2001
From: Naohisa Goto <ngotogenome@g...>
Date: Tue, 30 Nov 2021 14:23:07 +0900
Subject: Delete #if line during checking madvise() on Solaris

The madvise() declaration should always be compiled on Solaris
to check whether the declaration is good on the environment.
For the purpose, the #if line is unnecessary.
(There was also a trivial typo that the #if was not closed
by #endif and the check always failed with preprocessor error.)
---
 configure.ac | 1 -
 1 file changed, 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index bb58fad0896..0f7c0d5477f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1110,7 +1110,6 @@ main() https://github.com/ruby/ruby/blob/trunk/configure.ac#L1110
 		AC_CHECK_TYPES([caddr_t],[],[],[@%:@include <sys/types.h>])
 		AC_CACHE_CHECK([whether madvise declaration is needed], rb_cv_madvice_prototype_using_caddr_t,
 		  [RUBY_WERROR_FLAG([AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-		    @%:@if defined(HAVE_CADDR_T) && (defined(MADV_FREE) || defined(MADV_DONTNEED))
 		    @%:@include <sys/unistd.h>
 		    @%:@include <sys/mman.h>
 		    @%:@include <sys/types.h>
-- 
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