--- configure.ac
+++ configure.ac	2017/11/13 06:44:32
@@ -399,6 +399,21 @@
 
 AC_CHECK_HEADERS([openssl/ecdh.h])
 
+dnl RPC library
+AC_CHECK_FUNC([xdrmem_create],[], AC_SEARCH_LIBS([xdrmem_create],[rpc xdr nsl tirpc]))
+dnl Cygwin/recent glibc requires -I/usr/include/tirpc for <rpc/rpc.h>
+old_CFLAGS=$CFLAGS
+AC_CACHE_CHECK([where to find <rpc/rpc.h>], [lv_cv_xdr_cflags], [
+  for add_CFLAGS in '' '-I/usr/include/tirpc' 'missing'; do
+    if test x"$add_CFLAGS" = xmissing; then
+      lv_cv_xdr_cflags=missing; break
+    fi
+    CFLAGS="$old_CFLAGS $add_CFLAGS"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <rpc/rpc.h>
+    ]])], [lv_cv_xdr_cflags=${add_CFLAGS:-none}; break])
+  done
+])
+
 dnl Math library
 AC_CHECK_LIB([m], [pow], [MATH_LIB='-lm'], [MATH_LIB=''])
 AC_SUBST(MATH_LIB)