diff -uNr tmux-3.2a/configure.ac tmux-3.2a.mod/configure.ac
--- tmux-3.2a/configure.ac	2021-06-10 11:24:57.000000000 +0300
+++ tmux-3.2a.mod/configure.ac	2021-06-28 22:07:57.708407636 +0300
@@ -52,9 +52,6 @@
 PKG_PROG_PKG_CONFIG
 AC_USE_SYSTEM_EXTENSIONS
 
-# Default tmux.conf goes in /etc not ${prefix}/etc.
-test "$sysconfdir" = '${prefix}/etc' && sysconfdir=/etc
-
 # Is this --enable-debug?
 case "x$VERSION" in xnext*) enable_debug=yes;; esac
 AC_ARG_ENABLE(
@@ -153,37 +150,9 @@
 ])
 AC_FUNC_STRNLEN
 
-# Check if strtonum works.
-AC_MSG_CHECKING([for working strtonum])
-AC_RUN_IFELSE([AC_LANG_PROGRAM(
-         [#include <stdlib.h>],
-         [return (strtonum("0", 0, 1, NULL) == 0 ? 0 : 1);]
-	 )],
-	 [AC_DEFINE(HAVE_STRTONUM) AC_MSG_RESULT(yes)],
-	 [AC_LIBOBJ(strtonum) AC_MSG_RESULT(no)]
-)
-
-# Clang sanitizers wrap reallocarray even if it isn't available on the target
-# system. When compiled it always returns NULL and crashes the program. To
-# detect this we need a more complicated test.
-AC_MSG_CHECKING([for working reallocarray])
-AC_RUN_IFELSE([AC_LANG_PROGRAM(
-		[#include <stdlib.h>],
-		[return (reallocarray(NULL, 1, 1) == NULL);]
-	)],
-	AC_MSG_RESULT(yes),
-	[AC_LIBOBJ(reallocarray) AC_MSG_RESULT([no])],
-	[AC_LIBOBJ(reallocarray) AC_MSG_RESULT([no])]
-)
-AC_MSG_CHECKING([for working recallocarray])
-AC_RUN_IFELSE([AC_LANG_PROGRAM(
-		[#include <stdlib.h>],
-		[return (recallocarray(NULL, 1, 1, 1) == NULL);]
-	)],
-	AC_MSG_RESULT(yes),
-	[AC_LIBOBJ(recallocarray) AC_MSG_RESULT([no])],
-	[AC_LIBOBJ(recallocarray) AC_MSG_RESULT([no])]
-)
+AC_LIBOBJ(strtonum)
+AC_LIBOBJ(reallocarray)
+AC_LIBOBJ(recallocarray)
 
 # Look for clock_gettime. Must come before event_init.
 AC_SEARCH_LIBS(clock_gettime, rt)