HOW TO ADD HEADER FILES MANUALLY

How can I add a custom header file? Im using c-language

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I am having the same problem it gives clang-12: error: linker command failed with exit code 1 (use -v to see invocation) error when I am trying to run

Click the new file button and name the file with a .h extension

still not working :(

make a file named anything ending with .h

this doesn't work. When you include it in the main file it still gives an error

You can't use <> to include files without passing a directory the files are in to the compiler, use "" instead

still not working tho