From 5db592bcc2f643c87bbeee87719fe6f687119d74 Mon Sep 17 00:00:00 2001
From: 0x4D616E75 <0x4d616e75@elektronische-nachricht.de>
Date: Thu, 17 May 2018 18:55:15 +0200
Subject: [PATCH] fix loading of CURL and Backtracing library with CMake (#215)

to build on FreeBSD with default compiler (Clang 4.0)
---
 .circleci/config.yml         |  2 +-
 CMakeLists.txt               |  3 ++-
 README.md                    |  2 +-
 src/cpp-utils/CMakeLists.txt | 16 +++++++++++++++-
 4 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6d52cf7f..26e70bf6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -49,7 +49,7 @@ references:
         sudo chmod o-w /etc/apt/sources.list.d/clang.list
 
         DEBIAN_FRONTEND=noninteractive sudo apt-get update -qq
-        DEBIAN_FRONTEND=noninteractive sudo apt-get install -y git ccache $APT_COMPILER_PACKAGE cmake make libcurl4-openssl-dev libcrypto++-dev libssl-dev libfuse-dev python
+        DEBIAN_FRONTEND=noninteractive sudo apt-get install -y git ccache $APT_COMPILER_PACKAGE cmake3 make libcurl4-openssl-dev libcrypto++-dev libssl-dev libfuse-dev python
         # Use /dev/urandom when /dev/random is accessed to use less entropy
         sudo cp -a /dev/urandom /dev/random
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index dbd2b5d7..9962ec91 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,5 @@
-cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
+cmake_policy(VERSION 2.8)
 
 # note: for clang-tidy, we need cmake 3.6, or (if the return code should be handled correctly, e.g. on CI), we need 3.8.
 
diff --git a/README.md b/README.md
index b27087be..6c39ad18 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ Requirements
 ------------
   - Git (for getting the source code)
   - GCC version >= 4.8 or Clang >= 3.7
-  - CMake version >= 2.8
+  - CMake version >= 3.0 
   - libcurl4 (including development headers)
   - Boost libraries version >= 1.56 (including development headers)
     - filesystem
diff --git a/src/cpp-utils/CMakeLists.txt b/src/cpp-utils/CMakeLists.txt
index 089c201f..8b3a4fcd 100644
--- a/src/cpp-utils/CMakeLists.txt
+++ b/src/cpp-utils/CMakeLists.txt
@@ -50,7 +50,21 @@ set(SOURCES
 
 add_library(${PROJECT_NAME} STATIC ${SOURCES})
 
-target_link_libraries(${PROJECT_NAME} PUBLIC pthread curl)
+find_package(CURL)
+if(NOT ${CURL_FOUND})
+	message(FATAL_ERROR "CURL library not found")                                                 
+endif()
+include_directories(${CURL_INCLUDE_DIRS})
+target_link_libraries(${PROJECT_NAME} PUBLIC ${CURL_LIBRARIES})                                       
+
+find_package(Backtrace)
+if(NOT ${Backtrace_FOUND})
+	message(FATAL_ERROR "Backtrace library not found")                                            
+endif()
+include_directories(${Backtrace_INCLUDE_DIRS})
+target_link_libraries(${PROJECT_NAME} PUBLIC ${Backtrace_LIBRARIES}) 
+
+target_link_libraries(${PROJECT_NAME} PUBLIC pthread)
 
 # TODO From Crypto++ 5.7 on, it should support cmake with find_package() instead of find_library().
 find_library_with_path(CryptoPP cryptopp CRYPTOPP_LIB_PATH)