macos mojaveで

　pip3 install mojimoji

をすると下記でコケた。

pythonは
　brew install python3
でインストールしている。

Collecting mojimoji
Using cached https://files.pythonhosted.org/packages/6e/dd/b2fde54ecfd7f66e5a39ca0fd6245480af62e0d91dbe9d6a5d4551196e67/mojimoji-0.0.8.tar.gz
Building wheels for collected packages: mojimoji
Running setup.py bdist_wheel for mojimoji ... error
Complete output from command /usr/local/opt/python/bin/python3.7 -u -c "import setuptools, tokenize;file='/private/var/folders/y3/pbwjdvvd6g3f5ykh8qczlyd00000gn/T/pip-install-0fq2nxsl/mojimoji/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" bdist_wheel -d /private/var/folders/y3/pbwjdvvd6g3f5ykh8qczlyd00000gn/T/pip-wheel-w0ld4uog --python-tag cp37:
running bdist_wheel
running build
running build_ext
building 'mojimoji' extension
creating build
creating build/temp.macosx-10.14-x86_64-3.7
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -stdlib=libstdc++ -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c mojimoji.cpp -o build/temp.macosx-10.14-x86_64-3.7/mojimoji.o
warning: include path for stdlibc++ headers not found; pass '-std=libc++' on the command line to use the libc++ standard library instead [-Wstdlibcxx-not-found]
mojimoji.cpp:580:10: fatal error: 'tr1/unordered_map' file not found
#include
^~~~~~~~~~~~~~~~~~~
1 warning and 1 error generated.
error: command 'clang' failed with exit status 1

Failed building wheel for mojimoji
Running setup.py clean for mojimoji
Failed to build mojimoji
Installing collected packages: mojimoji
Running setup.py install for mojimoji ... error
Complete output from command /usr/local/opt/python/bin/python3.7 -u -c "import setuptools, tokenize;file='/private/var/folders/y3/pbwjdvvd6g3f5ykh8qczlyd00000gn/T/pip-install-0fq2nxsl/mojimoji/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /private/var/folders/y3/pbwjdvvd6g3f5ykh8qczlyd00000gn/T/pip-record-6cg8gdn2/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_ext
building 'mojimoji' extension
creating build
creating build/temp.macosx-10.14-x86_64-3.7
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -stdlib=libstdc++ -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c mojimoji.cpp -o build/temp.macosx-10.14-x86_64-3.7/mojimoji.o
warning: include path for stdlibc++ headers not found; pass '-std=libc++' on the command line to use the libc++ standard library instead [-Wstdlibcxx-not-found]
mojimoji.cpp:580:10: fatal error: 'tr1/unordered_map' file not found
#include
^~~~~~~~~~~~~~~~~~~
1 warning and 1 error generated.
error: command 'clang' failed with exit status 1

Command "/usr/local/opt/python/bin/python3.7 -u -c "import setuptools, tokenize;file='/private/var/folders/y3/pbwjdvvd6g3f5ykh8qczlyd00000gn/T/pip-install-0fq2nxsl/mojimoji/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /private/var/folders/y3/pbwjdvvd6g3f5ykh8qczlyd00000gn/T/pip-record-6cg8gdn2/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/y3/pbwjdvvd6g3f5ykh8qczlyd00000gn/T/pip-install-0fq2nxsl/mojimoji/

どうやら、↓が原因みたい。
https://stackoverflow.com/questions/42030598/mac-c-compiler-not-finding-tr1-unordered-map

【対処】
git clone https://github.com/studio-ousia/mojimoji
python3 setup.py install

でインストールできた。