From 559123682a94351a68dc975889c44d22049d027e Mon Sep 17 00:00:00 2001
From: Pat Hickey <pat@moreproductive.org>
Date: Mon, 19 Apr 2021 19:25:13 -0700
Subject: [PATCH] docker: install cmake from binary, xenials is too old to
 build llvm

---
 Dockerfile | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index c0a386f..7cdfd6c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,11 +6,19 @@ FROM ubuntu:xenial
 
 RUN apt-get update \
  && apt-get install -y --no-install-recommends \
+        curl \
+        ca-certificates \
         build-essential \
         clang \
-        cmake \
-        python \
+        python3 \
         git \
         ninja-build \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*
+
+RUN curl -sSLO https://github.com/Kitware/CMake/releases/download/v3.20.1/cmake-3.20.1-linux-x86_64.tar.gz \
+  && tar xf cmake-3.20.1-linux-x86_64.tar.gz \
+  && rm cmake-3.20.1-linux-x86_64.tar.gz \
+  && mkdir -p /opt \
+  && mv cmake-3.20.1-linux-x86_64 /opt/cmake
+ENV PATH /opt/cmake/bin:$PATH