Vscode hat eine Header-Datei und kann nicht kompiliert werden

d:/ComputerHomework/2019_winter/main.c:10: undefined reference to `ReadPathTkFile'

{
    "tasks": [
        {
            "type": "shell",
            "label": "gcc.exe build active file",
            "command": "C:\\mingw64\\bin\\gcc.exe",
            "args": [
                "-g",
                "${file}",
                "${fileDirname}\\IstkFile.c",
                "${fileDirname}\\PrintQuestion.c",
                "${fileDirname}\\MarkingSystemLib.c",
                "${fileDirname}\\zqyLib.c",
                "-o",
                "${fileDirname}\\${fileBasenameNoExtension}.exe"
                
            ],
            "options": {
                "cwd": "C:\\mingw64\\bin"
            }
        }
    ],
    "version": "2.0.0"
}