[macOS] proj_json_streaming_writer.hpp: error: 'int64_t' in namespace 'std' does not name a type

[barracuda156]

Some header is missing here, apparently:

In file included from proj/iso19111/common.cpp:44:
../src/include/R-libproj/proj_json_streaming_writer.hpp:42:14: error: 'int64_t' in namespace 'std' does not name a type
   42 | typedef std::int64_t GIntBig;
      |              ^~~~~~~
../src/include/R-libproj/proj_json_streaming_writer.hpp:43:14: error: 'uint64_t' in namespace 'std' does not name a type; did you mean 'wint_t'?
   43 | typedef std::uint64_t GUInt64;
      |              ^~~~~~~~
      |              wint_t
../src/include/R-libproj/proj_json_streaming_writer.hpp:93:14: error: 'GIntBig' has not been declared
   93 |     void Add(GIntBig nVal);
      |              ^~~~~~~
../src/include/R-libproj/proj_json_streaming_writer.hpp:93:10: error: 'void osgeo::proj::CPLJSonStreamingWriter::Add(int)' cannot be overloaded with 'void osgeo::proj::CPLJSonStreamingWriter::Add(int)'
   93 |     void Add(GIntBig nVal);
      |          ^~~
../src/include/R-libproj/proj_json_streaming_writer.hpp:91:10: note: previous declaration 'void osgeo::proj::CPLJSonStreamingWriter::Add(int)'
   91 |     void Add(int nVal) { Add(static_cast<GIntBig>(nVal)); }
      |          ^~~
../src/include/R-libproj/proj_json_streaming_writer.hpp:94:14: error: 'GUInt64' has not been declared
   94 |     void Add(GUInt64 nVal);
      |              ^~~~~~~
../src/include/R-libproj/proj_json_streaming_writer.hpp:94:10: error: 'void osgeo::proj::CPLJSonStreamingWriter::Add(int)' cannot be overloaded with 'void osgeo::proj::CPLJSonStreamingWriter::Add(int)'
   94 |     void Add(GUInt64 nVal);
      |          ^~~
../src/include/R-libproj/proj_json_streaming_writer.hpp:91:10: note: previous declaration 'void osgeo::proj::CPLJSonStreamingWriter::Add(int)'
   91 |     void Add(int nVal) { Add(static_cast<GIntBig>(nVal)); }
      |          ^~~
../src/include/R-libproj/proj_json_streaming_writer.hpp: In member function 'void osgeo::proj::CPLJSonStreamingWriter::Add(int)':
../src/include/R-libproj/proj_json_streaming_writer.hpp:91:42: error: 'GIntBig' does not name a type
   91 |     void Add(int nVal) { Add(static_cast<GIntBig>(nVal)); }
      |                                          ^~~~~~~
../src/include/R-libproj/proj_json_streaming_writer.hpp: In member function 'void osgeo::proj::CPLJSonStreamingWriter::Add(unsigned int)':
../src/include/R-libproj/proj_json_streaming_writer.hpp:92:51: error: 'GIntBig' does not name a type
   92 |     void Add(unsigned int nVal) { Add(static_cast<GIntBig>(nVal)); }
      |                                                   ^~~~~~~
make: *** [proj/iso19111/common.o] Error 1

Similar error on Ubuntu earlier: carla-simulator/carla#6776