From 4c5bae17d723d3a183421b0edc9d414637b70a88 Mon Sep 17 00:00:00 2001
From: Isaac Connor <isaac@zoneminder.com>
Date: Sat, 19 Jul 2025 19:00:17 -0400
Subject: [PATCH] Make nlohmann_json optional

---
 CMakeLists.txt          | 8 +++++++-
 src/zm_packet.h         | 4 ++++
 zoneminder-config.cmake | 1 +
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1ffa4399c..421615d05 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -591,7 +591,13 @@ if(HAVE_LIBPCRE AND HAVE_PCRE_H)
   set(ZM_PCRE 1)
 endif()
 
-find_package(nlohmann_json)
+find_package(nlohmann_json CONFIG)
+if(nlohmann_json_FOUND)
+  set(ZM_HAS_NLOHMANN_JSON 1)
+else()
+  set(ZM_HAS_NLOHMANN_JSON 0)
+  message(AUTHOR_WARNING "nlohmann_json headers weren't found - AI results will not be available")
+endif()
 
 # Check for mmap and enable in all components
 set(ZM_MEM_MAPPED 0)
diff --git a/src/zm_packet.h b/src/zm_packet.h
index fbfa27809..0f5c52a2d 100644
--- a/src/zm_packet.h
+++ b/src/zm_packet.h
@@ -29,7 +29,9 @@
 #include <mutex>
 #include <vector>
 
+#if HAS_NLOHMANN_JSON
 #include <nlohmann/json.hpp>
+#endif
 
 extern "C" {
 #include <libavformat/avformat.h>
@@ -61,7 +63,9 @@ class ZMPacket {
   bool decoded;
   std::vector<ZoneStats> zone_stats;
   std::string  alarm_cause;
+#if HAS_NLOHMANN_JSON
   nlohmann::json detections;
+#endif
 
  public:
   AVPacket *av_packet() { return packet.get(); }
diff --git a/zoneminder-config.cmake b/zoneminder-config.cmake
index 028762d3e..490718a86 100644
--- a/zoneminder-config.cmake
+++ b/zoneminder-config.cmake
@@ -47,6 +47,7 @@
 /* Few ZM options that are needed by the source code */
 #cmakedefine ZM_MEM_MAPPED 1
 #cmakedefine ZM_HAS_V4L2 1
+#cmakedefine ZM_HAS_NLOHMANN_JSON 1
 
 /* Its safe to assume that signal return type is void. This is a fix for zm_signal.h */
 #define RETSIGTYPE void