diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -124,6 +124,7 @@ find_package(ZLIB)
 find_package(LibLZMA)
 find_package(LZO)
 find_package(PNG)
+find_package(nlohmann_json)
 
 if(WIN32 OR EMSCRIPTEN)
     # Windows uses WinHttp for HTTP requests.
@@ -293,6 +294,7 @@ link_package(PNG TARGET PNG::PNG ENCOURA
 link_package(ZLIB TARGET ZLIB::ZLIB ENCOURAGED)
 link_package(LIBLZMA TARGET LibLZMA::LibLZMA ENCOURAGED)
 link_package(LZO)
+link_package(nlohmann_json ENCOURAGED)
 
 if(NOT WIN32 AND NOT EMSCRIPTEN)
     link_package(CURL ENCOURAGED)