This results in a difficult situation: fairly commonly used features, such as including other files in a makefile by reference, cannot be done portably!

这就导致出现了一种复杂的情况：很常用的一些特性，例如在 makefile 中通过引用来包含其他文件，都不能很好地移植！

youdao

"We brought in light engineering equipment, drills, the jaws of life, anything that can be carried portably, " said Robert Brown, a naval commander from Halifax, Canada.

CNN: O'Brien: Haiti's cultural core suffers, too