ProductName: Mac OS X
ProductVersion: 10.14.6
BuildVersion: 18G95
$ gcc --version
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/c++/4.2.1
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
ImportError: dlopen(/Applications/SageMath/local/lib/python3.7/site-packages/sage/symbolic/ring.cpython-37m-darwin.so, 2): Symbol not found: __ZNSt3__16vectorIN5GiNaC2exENS_9allocatorIS2_EEE11__vallocateEm
Referenced from: /Applications/SageMath/local/lib/python3.7/site-packages/sage/symbolic/ring.cpython-37m-darwin.so
Expected in: flat namespace
in /Applications/SageMath/local/lib/python3.7/site-packages/sage/symbolic/ring.cpython-37m-darwin.so