From 9b089b740104d487166c989d49f9f58e68e5d31e Mon Sep 17 00:00:00 2001
From: Ian Barwick <ian@2ndquadrant.com>
Date: Thu, 21 Mar 2019 10:30:00 +0900
Subject: [PATCH] doc: add note about compiling against Pg11 and later with the
 --with-llvm option

---
 doc/install-source.sgml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/doc/install-source.sgml b/doc/install-source.sgml
index 30126450..aa1a3301 100644
--- a/doc/install-source.sgml
+++ b/doc/install-source.sgml
@@ -136,6 +136,16 @@ deb-src http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main</programlisti
          </itemizedlist>
        </para>
      </note>
+
+     <tip>
+       <para>
+         If building against PostgreSQL 11 or later configured with the <option>--with-llvm</option> option
+         (this is the case with the PGDG-provided packages) you'll also need to install the
+         <literal>llvm-toolset-7-clang</literal> package. This is available via the
+         <ulink url="https://wiki.centos.org/AdditionalResources/Repositories/SCL">Software Collections (SCL) Repository</ulink>.
+       </para>
+     </tip>
+
     </listitem>
    </itemizedlist>
   </para>