vc++
include
vc folder include folder
" " include
exe file directory, system directory, search order fixed
linux include rtc.h
inlcude path
#include "..." search starts here
#include <...> search starts here
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.4.3/include
/usr/lib/gcc/x86_64-linux-gnu/4.4.3/include-fixed
/usr/include