Question

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How do I add a directory to C header include path?

I would like to set an include path for my mysql.h file which is located in another location, such as: "root/a/b/c".

I’ve tried:

#include "/a/b/c/mysql.h"

But it doesn’t compile. Am I missing an option?

Answer 1

In your .c file, you can use relative path to include the .h file. For example, if .c file is in /d/e/f/g folder and .h file is in /a/b/c folder, then your #include statement has to be

#include "../../../../a/b/c/mysql.h"

This is acceptable if the number of slashes is around 1 or 2 (2 is a bit dirty already). And it is not good if you move the folders around later.

Alternatively, you can only specify the name of the .h file, and use -I <dir> flag where you replace <dir> with the path to the folder that has .h file. If you move the folders around, you can just change a bit in the the compilation command (usually in a makefile).