first commit

third_party/nlohmann_json/meson.build

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+project('nlohmann_json',
+    'cpp',
+    version : '3.11.3',
+    license : 'MIT',
+)
+
+nlohmann_json_dep = declare_dependency(
+    include_directories: include_directories('single_include')
+)
+
+nlohmann_json_multiple_headers = declare_dependency(
+    include_directories: include_directories('include')
+)
+
+if not meson.is_subproject()
+install_headers('single_include/nlohmann/json.hpp', subdir: 'nlohmann')
+install_headers('single_include/nlohmann/json_fwd.hpp', subdir: 'nlohmann')
+
+pkgc = import('pkgconfig')
+pkgc.generate(name: 'nlohmann_json',
+    version: meson.project_version(),
+    description: 'JSON for Modern C++'
+)
+endif