Thanks for the suggestion, I installed the attached slightly-different patch.
>From 70ce53307e1d9ef3354c73ef7b0969bbc7392f43 Mon Sep 17 00:00:00 2001 From: Paul Eggert <egg...@cs.ucla.edu> Date: Fri, 7 Aug 2015 18:09:17 -0700 Subject: [PATCH] Add /opt/X11/include to X search path
* lib/autoconf/libs.m4 (_AC_PATH_X_DIRECT): Add /opt/X11/include for OS X. Problem reported by Daniel Macks at: http://lists.gnu.org/archive/html/bug-autoconf/2015-08/msg00002.html --- lib/autoconf/libs.m4 | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/autoconf/libs.m4 b/lib/autoconf/libs.m4 index eab753c..d2040d7 100644 --- a/lib/autoconf/libs.m4 +++ b/lib/autoconf/libs.m4 @@ -238,6 +238,8 @@ ac_x_header_dirs=' /usr/local/include/X11R5 /usr/local/include/X11R4 +/opt/X11/include + /usr/X386/include /usr/x386/include /usr/XFree86/include/X11 -- 2.1.0
