1 files changed, 3 insertions, 0 deletions
diff --git a/wscript b/wscript
index 052bb014..f59dda7f 100644
--- a/wscript
+++ b/wscript
@@ -285,6 +285,9 @@ def configure(conf):
     if haru:
         conf.env.append_value('LIBDCP_HAVE_HARU', '1')
 
+    if conf.check_cxx(header_name="nlohmann/json.hpp", uselib_store='JSON', define_name='LIBDCP_HAVE_JSON', mandatory=False):
+        conf.env.append_value('LIBDCP_HAVE_JSON', '1')
+
     if not conf.env.DISABLE_TESTS:
         conf.recurse('test')
         if conf.options.enable_gcov: