FIX: Fix nlohmann_json install

Author: threecgreen

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.10.1 - TBD
+
+#### Bug fixes
+- Fixed installation of `nlohmann_json` when using bundled version
+
 ## 0.10.0 - 2023-07-20
 
 #### Enhancements

CMakeLists.txt

@@ -122,6 +122,8 @@ if(${PROJECT_NAME_UPPERCASE}_USE_EXTERNAL_JSON)
   find_package(nlohmann_json REQUIRED)
 else()
   set(json_version 3.11.2)
+  # Required to correctly install nlohmann_json
+  set(JSON_Install ON)
   if(CMAKE_VERSION VERSION_LESS 3.24)
     FetchContent_Declare(
       json

README.md

@@ -36,17 +36,15 @@ target_link_libraries(example PRIVATE databento::databento)
 
 Alternatively, you can clone the source code from GitHub [here](https://github.com/databento/databento-cpp).
 
-To install the library at the system level, build and install it with the following:
+To install the library to `/usr`, build and install it with the following:
 
 ```sh
 git clone https://github.com/databento/databento-cpp
 cd databento-cpp
 cmake -S . -B build \
   -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-  -DCMAKE_INSTALL_PREFIX='/usr' \
-  -DDATABENTO_USE_EXTERNAL_JSON=ON \
-  -DDATABENTO_USE_EXTERNAL_HTTPLIB=ON
-cmake --build build --target databento
+  -DCMAKE_INSTALL_PREFIX='/usr'
+cmake --build build --target databento --parallel 8
 cmake --install build
 ```