Question regarding headers to be exported

[Lukasz Majewski]

Dear Community,

Recently, I've been delving into Makefiles to understand the idea
behind the way headers are exported (installed) on the target system.

There is sysdep_headers variable, which adds some files (like
sys/timerfd.h, bits/shmlba.h) but also some files are exported when
they are placed in the ./include/* directory (includedir variable).

One example is struct_timespec.h:

./include/bits/types/struct_timespec.h -> here we just have #include to
					  exported one
./time/bits/types/struct_timespec.h


I'm wondering why all exported files are not just added to
"sysdep_headers" (or any other variable)?

Why do we have some indirection with "includedir" variable (and
repetition of directory tree) ?

Thanks in advance for the explanation.


Best regards,

Lukasz Majewski

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