From 903b094ceb0f89db906b2e77fd65ba0f0faa65d0 Mon Sep 17 00:00:00 2001
From: Richard Hodges <hodges.r@gmail.com>
Date: Wed, 16 Sep 2020 19:13:55 +0200
Subject: [PATCH] Fix ubuntu-20 clang docker build

fixes #2029
fixes #2091
---
 .dockers/ubuntu-20/user-config.jam | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.dockers/ubuntu-20/user-config.jam b/.dockers/ubuntu-20/user-config.jam
index 544e0eb1..87ee4173 100644
--- a/.dockers/ubuntu-20/user-config.jam
+++ b/.dockers/ubuntu-20/user-config.jam
@@ -7,5 +7,5 @@ feature.compose <asio.mode>ts : <define>"BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT"
 feature.compose <asio.mode>nodep-nots : <define>"BOOST_ASIO_NO_DEPRECATED" <define>"BOOST_ASIO_NO_TS_EXECUTORS" ;
 feature.compose <asio.mode>nodep-ts : <define>"BOOST_ASIO_NO_DEPRECATED" <define>"BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT" ;
 
-using clang :   : clang++ : <stdlib>"libc++" <cxxflags>"-Wno-c99-extensions" ;
+using clang :   : clang++ : <cxxflags>-stdlib=libc++ <cxxflags>"-DBOOST_ASIO_DISABLE_CONCEPTS" <cxxflags>"-Wno-c99-extensions" <linkflags>-stdlib=libc++ ;
 using gcc :   : g++ : <cxxflags>"-Wno-c99-extensions" ;