--- vim81/src/configure.ac	2018-05-13 03:37:01.000000000 -1000
+++ vim81+iPhone/src/configure.ac	2018-07-27 09:41:25.000000000 -1000
@@ -5,6 +5,7 @@
 
 AC_INIT(vim.h)
 AC_CONFIG_HEADER(auto/config.h:config.h.in)
+AC_CHECK_HEADERS([sys/types.h])
 
 dnl Being able to run configure means the system is Unix (compatible).
 AC_DEFINE(UNIX)