Compiling error when build on macOS

[drwjf]

cmake output attached as the following:

% cmake -DWITH_GEOJSON=OFF -DCMAKE_BUILD_TYPE=Release ..
-- The C compiler identification is AppleClang 13.1.6.13160021
-- The CXX compiler identification is AppleClang 13.1.6.13160021
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode_13.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode_13.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Boost: /usr/local/lib/cmake/Boost-1.81.0/BoostConfig.cmake (found suitable version "1.81.0", minimum required is "1.69.0")  
-- Found Lua51: /usr/local/lib/liblua5.1.dylib (found version "5.1.5") 
-- sdl2 found: includes in /usr/local/include/SDL2, library in /usr/local/lib/libSDL2.dylib;-framework Cocoa
-- Found SDL2_mixer: /usr/local/lib/libSDL2_mixer.dylib (found version "2.6.3") 
-- Found library tolua++: /opt/local/lib/libtoluapp.dylib
-- Found program tolua++: /opt/local/bin/toluapp
-- Found ZLIB: /Applications/Xcode_13.4.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/lib/libz.tbd (found version "1.2.11") 
-- Found X11: /usr/local/include   
-- Looking for XOpenDisplay in /usr/local/lib/libX11.dylib;/usr/local/lib/libXext.dylib
-- Looking for XOpenDisplay in /usr/local/lib/libX11.dylib;/usr/local/lib/libXext.dylib - found
-- Looking for gethostbyname
-- Looking for gethostbyname - found
-- Looking for connect
-- Looking for connect - found
-- Looking for remove
-- Looking for remove - found
-- Looking for shmat
-- Looking for shmat - found
-- Found OpenGL: /Applications/Xcode_13.4.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/System/Library/Frameworks/OpenGL.framework   
-- Could not find OpenGL ES 1.1 libraries
-- Found PkgConfig: /usr/local/bin/pkg-config (found version "0.29.2") 
-- Checking for module 'sqlite3'
--   Found sqlite3, version 3.32.3
-- Found Sqlite: /Applications/Xcode_13.4.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include  
-- Found Doxygen: /usr/local/bin/doxygen (found version "1.9.6") found components: doxygen dot 
-- Using OpenGL
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for stdint.h
-- Looking for stdint.h - found
-- Looking for stddef.h
-- Looking for stddef.h - found
-- Check size of errno_t
-- Check size of errno_t - done
-- Looking for strcpy_s
-- Looking for strcpy_s - not found
-- Looking for strncpy_s
-- Looking for strncpy_s - not found
-- Looking for strcasestr
-- Looking for strcasestr - found
-- Looking for strnlen
-- Looking for strnlen - found
-- Looking for getopt
-- Looking for getopt - found
-- Looking for strcat_s
-- Looking for strcat_s - not found
==================================
Debug mode: No (Enable by param -DCMAKE_BUILD_TYPE=Debug)
Strip executables: No (Enable by param -DENABLE_STRIP=ON)
Static linking: No (Enable by param -DENABLE_STATIC=ON)
Place game files in: game directory (Place in user directory with -DENABLE_USEGAMEDIR=OFF)
Parallel building in MSVC: Yes (Disable by param -DENABLE_MULTIBUILD=OFF)
Platform: Mac
Touchscreen input: No (Enable by param -DENABLE_TOUCHSCREEN=ON)
Metaserver: No (Enable by param -DENABLE_METASERVER=ON)
Doxygen documentation: No (Enable by param -DENABLE_DOC=ON)
Game development files: No (Enable by param -DENABLE_DEV=ON)
Upx packer: No (Enable by param -DENABLE_UPX=ON)
X11: Found and enabled (Disable by param -DWITH_X11=OFF)
==================================
-- Configuring done
-- Generating done

make output attached too:

[  1%] Automatic MOC for target archimedes
[  1%] Built target archimedes_autogen
[  3%] Building CXX object archimedes/CMakeFiles/archimedes.dir/cmake_pch.hxx.pch
[  4%] Building CXX object archimedes/CMakeFiles/archimedes.dir/archimedes_autogen/mocs_compilation.cpp.o
[  6%] Building CXX object archimedes/CMakeFiles/archimedes.dir/Unity/unity_database_cxx.cxx.o
[  7%] Building CXX object archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx.o
In file included from Wyrmgus/build/archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx:5:
Wyrmgus/archimedes/src/language/grammatical_gender.cpp:10:55: error: explicit specialization of 'property_class_identifier' after instantiation
const std::string enum_converter<grammatical_gender>::property_class_identifier = "archimedes::grammatical_gender";
                                                      ^
Wyrmgus/archimedes/src/language/grammatical_gender.h:14:23: note: explicit instantiation first required here
extern template class enum_converter<grammatical_gender>;
                      ^
In file included from Wyrmgus/build/archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx:5:
Wyrmgus/archimedes/src/language/grammatical_gender.cpp:13:85: error: explicit specialization of 'string_to_enum_map' after instantiation
const std::map<std::string, grammatical_gender> enum_converter<grammatical_gender>::string_to_enum_map = {
                                                                                    ^
Wyrmgus/archimedes/src/language/grammatical_gender.h:14:23: note: explicit instantiation first required here
extern template class enum_converter<grammatical_gender>;
                      ^
In file included from Wyrmgus/build/archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx:5:
Wyrmgus/archimedes/src/language/grammatical_gender.cpp:21:48: error: explicit specialization of 'initialized' after instantiation
const bool enum_converter<grammatical_gender>::initialized = enum_converter::initialize();
                                               ^
Wyrmgus/archimedes/src/language/grammatical_gender.h:14:23: note: explicit instantiation first required here
extern template class enum_converter<grammatical_gender>;
                      ^
In file included from Wyrmgus/build/archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx:5:
Wyrmgus/archimedes/src/language/grammatical_gender.cpp:21:62: error: 'enum_converter' is not a class, namespace, or enumeration
const bool enum_converter<grammatical_gender>::initialized = enum_converter::initialize();
                                                             ^
Wyrmgus/archimedes/src/util/enum_converter.h:12:7: note: 'enum_converter' declared here
class enum_converter final : public enum_converter_base
      ^
In file included from Wyrmgus/build/archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx:15:
Wyrmgus/archimedes/src/language/word_type.cpp:10:46: error: explicit specialization of 'property_class_identifier' after instantiation
const std::string enum_converter<word_type>::property_class_identifier = "archimedes::word_type";
                                             ^
Wyrmgus/archimedes/src/language/word_type.h:21:23: note: explicit instantiation first required here
extern template class enum_converter<word_type>;
                      ^
In file included from Wyrmgus/build/archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx:15:
Wyrmgus/archimedes/src/language/word_type.cpp:13:67: error: explicit specialization of 'string_to_enum_map' after instantiation
const std::map<std::string, word_type> enum_converter<word_type>::string_to_enum_map = {
                                                                  ^
Wyrmgus/archimedes/src/language/word_type.h:21:23: note: explicit instantiation first required here
extern template class enum_converter<word_type>;
                      ^
In file included from Wyrmgus/build/archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx:15:
Wyrmgus/archimedes/src/language/word_type.cpp:28:39: error: explicit specialization of 'initialized' after instantiation
const bool enum_converter<word_type>::initialized = enum_converter::initialize();
                                      ^
Wyrmgus/archimedes/src/language/word_type.h:21:23: note: explicit instantiation first required here
extern template class enum_converter<word_type>;
                      ^
In file included from Wyrmgus/build/archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx:15:
Wyrmgus/archimedes/src/language/word_type.cpp:28:53: error: 'enum_converter' is not a class, namespace, or enumeration
const bool enum_converter<word_type>::initialized = enum_converter::initialize();
                                                    ^
Wyrmgus/archimedes/src/util/enum_converter.h:12:7: note: 'enum_converter' declared here
class enum_converter final : public enum_converter_base
      ^
8 errors generated.
make[2]: *** [archimedes/CMakeFiles/archimedes.dir/Unity/unity_language_cxx.cxx.o] Error 1
make[1]: *** [archimedes/CMakeFiles/archimedes.dir/all] Error 2
make: *** [all] Error 2