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+%global debug_package %{nil}
+%global test_data_version 3.1.0
+%global bundled_hedley_version 15
+
+Name:           json
+Version:        3.11.3
+Release:        1
+
+# The entire source is MIT except
+# include/nlohmann/thirdparty/hedley/hedley.hpp, which is CC0-1.0
+License:        MIT AND CC0-1.0
+Summary:        JSON for Modern C++
+URL:            https://github.com/nlohmann/%{name}
+Source0:        %{url}/archive/v%{version}/%{name}-%{version}.tar.gz
+Source1:        https://github.com/nlohmann/json_test_data/archive/v%{test_data_version}/json_test_data-%{test_data_version}.tar.gz
+
+BuildRequires:  cmake
+BuildRequires:  gcc-c++
+BuildRequires:  ninja-build
+
+# Build requirements for the tests.
+BuildRequires:  doctest-devel
+BuildRequires:  gawk
+
+%description
+This is a packages version of the nlohmann/json header-only C++
+library available at Github.
+
+%package devel
+Summary:        Development files for %{name}
+Provides:       %{name}-static = %{?epoch:%{epoch}:}%{version}-%{release}
+# This package is also known as nlohmann-json, provide some alternate names
+# to make it easier to find
+Provides:       nlohmann-json-devel = %{?epoch:%{epoch}:}%{version}-%{release}
+Provides:       nlohmann-json-static = %{?epoch:%{epoch}:}%{version}-%{release}
+Provides:       nlohmann_json-devel = %{?epoch:%{epoch}:}%{version}-%{release}
+Provides:       nlohmann_json-static = %{?epoch:%{epoch}:}%{version}-%{release}
+Provides:       bundled(hedley) = %{bundled_hedley_version}
+Requires:       libstdc++-devel%{?_isa}
+
+%description devel
+The %{name}-devel package contains C++ header files for developing
+applications that use %{name}.
+
+%prep
+%autosetup -p1
+%setup -q -D -T -a1
+
+# Unbundle doctest. Used only in tests.
+ln -svf %{_includedir}/doctest/doctest.h ./tests/thirdparty/doctest/doctest.h
+
+%build
+%cmake \
+    -DJSON_BuildTests:BOOL=OFF \
+    -DJSON_Install:BOOL=ON \
+    -DJSON_TestDataDirectory:STRING=json_test_data-%{test_data_version} \
+    -DJSON_MultipleHeaders:BOOL=ON
+%make_build
+
+%install
+%make_install
+
+%files devel
+%doc README.md
+%license LICENSE.MIT
+%{_includedir}/nlohmann/
+%{_datadir}/cmake/nlohmann_json/
+%{_datadir}/pkgconfig/nlohmann_json.pc
+
+%changelog