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I have excluded a "c" file from a build (get diagonal line on the file) and I can't find out how to re added it to the build, I deleted it and added it again but it still have the diagonal line,
right-click on the file in the project explorer and select 'Properties'. Then uncheck the "Exclude resources from build" checkbox in the 'Build Steps' (Undeer the 'Build') option in the left.