https://git.ruby-lang.org/ruby.git/commit/?id=166d148355

From 166d148355384c73d18c8465eb99dbc69e3eb400 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 6 Jul 2021 19:35:38 +0900
Subject: Fix check for malloc_conf when no library is required

---
 configure.ac | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index d6f00aa..015237c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1303,8 +1303,11 @@ AS_IF([test "x$with_jemalloc" != xno],[ https://github.com/ruby/ruby/blob/trunk/configure.ac#L1303
       with_jemalloc=yes
     ],
     [test x$with_jemalloc = xyes && with_jemalloc=no])
-  AC_CHECK_HEADER(jemalloc/jemalloc.h, [
-    AC_DEFINE(RUBY_ALTERNATIVE_MALLOC_HEADER, [<jemalloc/jemalloc.h>])
+  for malloc_header in jemalloc/jemalloc.h jemalloc.h; do
+    AC_CHECK_HEADER($malloc_header, [break], [malloc_header=])
+  done
+  AS_IF([test "$malloc_header" != ""], [
+    AC_DEFINE_UNQUOTED(RUBY_ALTERNATIVE_MALLOC_HEADER, [<$malloc_header>])
   ],
   [test x$with_jemalloc = xyes && with_jemalloc=no])
   AS_IF([test "x$with_jemalloc" != xyes], [
@@ -1313,7 +1316,7 @@ AS_IF([test "x$with_jemalloc" != xno],[ https://github.com/ruby/ruby/blob/trunk/configure.ac#L1316
       @%:@ifdef RUBY_ALTERNATIVE_MALLOC_HEADER
       @%:@include RUBY_ALTERNATIVE_MALLOC_HEADER
       @%:@else
-      @%:@include <jemalloc.h>
+      extern const char *malloc_conf;
       @%:@endif], [return !&malloc_conf])],
       [rb_cv_jemalloc_demangle=yes],
       [rb_cv_jemalloc_demangle=no])
-- 
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