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cmake_minimum_required(VERSION 3.6)
project(nlohmann-json-download NONE)
include(ExternalProject)
ExternalProject_Add(
nlohmann_json
PREFIX .
GIT_REPOSITORY "https://github.com/nlohmann/json.git"
GIT_TAG v3.11.3
GIT_CONFIG advice.detachedHead=false # otherwise we'll get "You are in 'detached HEAD' state..."
SOURCE_DIR "${CMAKE_BINARY_DIR}/third-party/json"
GIT_SHALLOW 1 # No history needed (requires cmake 3.6)
# Override default steps with no action, we just want the clone step.
CONFIGURE_COMMAND ""
BUILD_COMMAND ""
INSTALL_COMMAND ""
)