From e7a1ce91cd311fde94a8011e2869a7f9fc018f41 Mon Sep 17 00:00:00 2001
From: Alexey Sheplyakov <asheplyakov@altlinux.org>
Date: Thu, 19 Dec 2019 18:17:41 +0400
Subject: [PATCH] build: use bundled CLN if available

So one can unpack CLN tarball (or clone CLN git repository) and compile
both CLN and GiNaC in one pass:

git clone git://ginac.de/ginac.git
cd ginac
git clone git://www.ginac.de/cln.git
mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo .. && make
---
 CMakeLists.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa221ff7..aab81f25 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,7 +45,14 @@ endif()
 
 set (CMAKE_CXX_STANDARD 11)
 
-find_package(CLN 1.2.2 REQUIRED)
+if (NOT DEFINED CLN_SOURCE_DIR)
+	set(CLN_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/cln)
+endif()
+if (EXISTS ${CLN_SOURCE_DIR}/CMakeLists.txt)
+	add_subdirectory(${CLN_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR}/cln)
+else()
+	find_package(CLN 1.2.2 REQUIRED)
+endif()
 
 include(CheckIncludeFile)
 check_include_file("unistd.h" HAVE_UNISTD_H)
-- 
2.50.0