From f37cd7550285d9c2528e8a94991b91fe83af7b1e Mon Sep 17 00:00:00 2001
From: Martin Brodbeck <martin@brodbeck-online.de>
Date: Fri, 11 Oct 2019 09:09:18 +0200
Subject: [PATCH] using system json lib if available (works on Arch Linux)

---
 meson.build | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/meson.build b/meson.build
index 35b6250..bceed86 100644
--- a/meson.build
+++ b/meson.build
@@ -10,8 +10,14 @@ cmake = import('cmake')
 
 #csv = cmake.subproject('csv-parser')
 #csv_lib = csv.dependency('csv')
-nlohmann = cmake.subproject('nlohmann_json', cmake_options : ['-DJSON_BuildTests=OFF', '-DCMAKE_BUILD_TYPE=Release'])
-nlohmann_lib = nlohmann.dependency('nlohmann_json')
+
+nlohmann_lib = dependency('nlohmann_json', version : '>=3.5.0', required : false)
+
+if not nlohmann_lib.found()
+  nlohmann = cmake.subproject('nlohmann_json', 
+                            cmake_options : ['-DJSON_BuildTests=OFF', '-DCMAKE_BUILD_TYPE=Release'])
+  nlohmann_lib = nlohmann.dependency('nlohmann_json')
+endif
 
 singleapp_proj = subproject('singleapplication')
 singleapp_lib = singleapp_proj.get_variable('singleapp_lib')