xcode 致命错误：string.h：没有那个文件或目录
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fatal error: string.h: No such file or directory
提问by hiroyuki tanaka
In my environment, I couldn't include <cstring>.
My g++ version is 4.9.3 (Homebrew gcc49 4.9.3).
在我的环境中，我无法包含<cstring>. 我的 g++ 版本是 4.9.3 (Homebrew gcc49 4.9.3)。
The error is:
错误是：
- /usr/local/Cellar/gcc49/4.9.3/include/c++/4.9.3/cstring:42:20: fatal
error: string.h: No such file or directory
"#include string.h"
But, in another environment (g++ 4.8.4[Ubuntu 4.8.4-2ubuntu1~14.04.3]), I can include <cstring>and run.
但是，在另一个环境（g++ 4.8.4[Ubuntu 4.8.4-2ubuntu1~14.04.3]）中，我可以包含<cstring>并运行。
What's the problem and how do I solve it?
有什么问题，我该如何解决？
[P.S.] Maybe, I misunderstood about the problem. I tried to run my previous code, but got an error like this:
[PS] 也许，我误解了这个问题。我试图运行我以前的代码，但得到了这样的错误：
/usr/local/Cellar/gcc49/4.9.3/include/c++/4.9.3/cassert:43:20: fatal error: assert.h: No such file or directory
#include <assert.h>
Then, I can't run my code. It is a g++'s problem.
然后，我无法运行我的代码。这是 g++ 的问题。
I checked this article, but this procedure is not working. I already installed xcode-select (commmad line tool) and I uninstalled xcode-select and reinstalled xcode-select, but it's not working.
我检查了这篇文章，但这个程序不起作用。我已经安装了 xcode-select（命令行工具）并且我卸载了 xcode-select 并重新安装了 xcode-select，但它不起作用。
回答by Tim Givois
Reinstalling the heaaders fixed my issue:
重新安装标题修复了我的问题：
open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg
