don't install other pieces

src/CMakeLists.txt

@@ -42,7 +42,8 @@ if (USE_EXTERNAL_JSON)
 else()
   message("Using internal JSON library")
   set(JSON_BuildTests OFF CACHE INTERNAL "")
-  add_subdirectory(exts/nlohmann_json)
+  set(JSON_Install OFF CACHE INTERNAL "")
+  add_subdirectory(exts/nlohmann_json EXCLUDE_FROM_ALL)
   set(JSON_LIBS "nlohmann_json::nlohmann_json")
 endif()
 
@@ -74,8 +75,8 @@ if (USE_PYTHON)
     message("Using external pybind11")
   else()
     message("Using internal pybind11")
-    add_subdirectory(exts/pybind11)
-    add_subdirectory(exts/pybind11_json)
+    add_subdirectory(exts/pybind11 EXCLUDE_FROM_ALL)
+    add_subdirectory(exts/pybind11_json EXCLUDE_FROM_ALL)
   endif()
   # Add python lib
   message("Building labRemote python module")