相关疑难解决方法(0)

我最近买了一台新的MacBook,我转移了我的旧会话.从那时起,在我升级到10.13之后,我无法得到任何包括iostream在内的任何东西.
鉴于此计划:

#include <iostream>

int main(void)
{
    std::cout << "Hello world !" << std::endl;
    return 0;
}

在以下时间给出我的输出g++ main.cpp:

In file included from main.cpp:1:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/iostream:38:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/ios:216:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/__locale:15:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string:470:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string_view:171:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/__string:56:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:640:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:629:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/typeinfo:61:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/exception:82:
In file included from …

错误

Error running 'env GEM_HOME=/Users/john/.rvm/gems/ruby-2.3.8@global

我2.3.8在 MacOs Catalina 中尝试安装 ruby​​ 时遇到此错误10.15.2

$ rvm install 2.3.8


Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.15/x86_64/ruby-2.3.8.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Certificates bundle '/usr/local/etc/openssl@1.1/cert.pem' is already up to date.
Requirements installation successful.
Installing Ruby from source to: /Users/john/.rvm/rubies/ruby-2.3.8, this may take a while depending on your cpu(s)...
ruby-2.3.8 - …