Including config.h once is enough ...
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-rw-r--r-- 18483 COPYING
-rw-r--r-- 69499 CREDITS
drwxr-xr-x - Documentation
-rw-r--r-- 27777 MAINTAINERS
-rw-r--r-- 16591 Makefile
-rw-r--r-- 14318 README
-rw-r--r-- 2855 REPORTING-BUGS
-rw-r--r-- 7993 Rules.make
drwxr-xr-x - arch
drwxr-xr-x - drivers
drwxr-xr-x - fs
drwxr-xr-x - include
drwxr-xr-x - init
drwxr-xr-x - ipc
drwxr-xr-x - kernel
drwxr-xr-x - lib
drwxr-xr-x - mm
drwxr-xr-x - net
drwxr-xr-x - scripts