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Adding the value of the directive include
in quotation marks, the file will be searched relative to the current directory. To include a header from a top/previous folder, you can use two dots:
#include "../header1.h"
If I understand your example:
#include "../headers/header1.h"
???. You who include
header.h
but you have as availableheader1.h
.– Augusto Vasques