--- configure.orig	2026-06-21 10:16:29 UTC
+++ configure
@@ -102229,6 +102229,7 @@ fi
 fi
 
         ac_fn_check_decl "$LINENO" "__syscall" "ac_cv_have_decl___syscall" "#include <sys/syscall.h>
+      #include <unistd.h>
 " "$ac_c_undeclared_builtin_options" "CFLAGS"
 if test "x$ac_cv_have_decl___syscall" = xyes
 then :