main.c:3:10: fatal error: test.h: No such file or directory

根据引用所提供的信息，当编译hello world程序时，出现了"main.c:3:10: fatal error: test.h: No such file or directory"的错误。这个错误表明编译器无法找到"test.h"头文件。

为了解决这个问题，你可以按照引用所给出的方法，通过设置环境变量来告诉编译器头文件的位置。

你可以使用以下命令设置C_INCLUDE_PATH和CPLUS_INCLUDE_PATH环境变量：

export C_INCLUDE_PATH=[你的头文件的位置]
export CPLUS_INCLUDE_PATH=[你的头文件的位置]

将"[你的头文件的位置]"替换为实际的test.h头文件所在的路径。然后重新编译你的程序，应该就能成功找到test.h头文件并解决这个错误了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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