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Fixed header files 

GNU CC needs to install corrected versions of some system header files. This is because most target systems have some header files that won’t work with GNU CC unless they are changed. Some have bugs, some are incompatible with ANSI C, and some depend on special features of other compilers.

Installing GNU CC automatically creates and installs the fixed header files, by running a program called fixincludes (or for certain targets an alternative such as ‘fixinc.svr4’). Normally, you don’t need to pay attention to this. But there are cases where it doesn’t do the right thing automatically.

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