http://cvs.savannah.gnu.org/viewvc/global/global/configure.ac?r1=1.204&r2=1.205
http://cvs.savannah.gnu.org/viewvc/global/global/configure.ac?r1=1.210&r2=1.211

diff -rup a/configure.ac b/configure.ac
--- a/configure.ac	2020-09-03 02:27:00.000000000 -0400
+++ b/configure.ac	2023-03-03 15:48:36.992369851 -0500
@@ -74,7 +74,8 @@ case "$host_os" in
 AC_MSG_CHECKING(whether POSIX.1-2008 realpath is equipped)
 AC_CACHE_VAL(ac_cv_posix1_2008_realpath,
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[
-main(){ (void)realpath("/./tmp", (void *)0); return 0; }
+#include <stdlib.h>
+int main(){ (void)realpath("/./tmp", (void *)0); return 0; }
 ]])],[ac_cv_posix1_2008_realpath=yes],
 [ac_cv_posix1_2008_realpath=no])])
 AC_MSG_RESULT($ac_cv_posix1_2008_realpath)
diff -rup a/configure b/configure
--- a/configure	2020-09-03 02:27:14.000000000 -0400
+++ b/configure	2023-03-03 15:48:43.208599392 -0500
@@ -14287,7 +14287,8 @@ else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
-main(){ (void)realpath("/./tmp", (void *)0); return 0; }
+#include <stdlib.h>
+int main(){ (void)realpath("/./tmp", (void *)0); return 0; }
 
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :