https://github.com/rakshasa/rtorrent/commit/3f72e2760305936b27904d0080a5fb5600948bd5

From 3f72e2760305936b27904d0080a5fb5600948bd5 Mon Sep 17 00:00:00 2001
From: rakshasa <sundell.software@gmail.com>
Date: Sat, 27 Feb 2021 22:13:01 +0900
Subject: [PATCH] Replaced custom execinfo autoconf test.

--- a/configure.ac
+++ b/configure.ac
@@ -20,8 +20,6 @@ TORRENT_DISABLE_IPV6
 
 AC_SYS_LARGEFILE
 
-TORRENT_CHECK_EXECINFO
-
 TORRENT_ENABLE_ARCH
 TORRENT_WITH_SYSROOT
 
@@ -29,6 +27,7 @@ TORRENT_WITHOUT_VARIABLE_FDSET
 TORRENT_WITHOUT_STATVFS
 TORRENT_WITHOUT_STATFS
 
+AX_EXECINFO
 AX_PTHREAD([], AC_MSG_ERROR([requires pthread]))
 AX_WITH_CURSES
 
--- a/scripts/common.m4
+++ b/scripts/common.m4
@@ -150,21 +150,6 @@ dnl   Need to fix this so that it uses the stuff defined by the system.
   ])
 ])
 
-AC_DEFUN([TORRENT_CHECK_EXECINFO], [
-  AC_MSG_CHECKING(for execinfo.h)
-
-  AC_COMPILE_IFELSE([AC_LANG_SOURCE([
-      #include <execinfo.h>
-      int main() { backtrace((void**)0, 0); backtrace_symbols((char**)0, 0); return 0;}
-      ])],
-    [
-      AC_MSG_RESULT(yes)
-      AC_DEFINE(USE_EXECINFO, 1, Use execinfo.h)
-    ], [
-      AC_MSG_RESULT(no)
-  ])
-])
-
 AC_DEFUN([TORRENT_CHECK_ALIGNED], [
   AC_MSG_CHECKING(the byte alignment)
 
--- a/src/main.cc
+++ b/src/main.cc
@@ -53,7 +53,7 @@
 #include <rak/functional.h>
 #include <rak/error_number.h>
 
-#ifdef USE_EXECINFO
+#ifdef HAVE_BACKTRACE
 #include <execinfo.h>
 #endif
 
@@ -533,7 +533,7 @@ handle_sigbus(int signum, siginfo_t* sa, void* ptr) {
   std::stringstream output;
   output << "Caught SIGBUS, dumping stack:" << std::endl;
 
-#ifdef USE_EXECINFO
+#ifdef HAVE_BACKTRACE
   void* stackPtrs[20];
 
   // Print the stack and exit.
@@ -604,7 +604,7 @@ do_panic(int signum) {
 
   output << "Caught " << SignalHandler::as_string(signum) << ", dumping stack:" << std::endl;
   
-#ifdef USE_EXECINFO
+#ifdef HAVE_BACKTRACE
   void* stackPtrs[20];
 
   // Print the stack and exit.