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    <p>The problem you have is probably these two points:</p> <ol> <li>The current user does not have <code>/sbin/</code> in his <code>$PATH</code>.</li> <li>The current user is not allowed to write to the block device to create a file system on it.</li> </ol> <p>The first problem is easily amended by just writing the full path instead of just the command in the Makefile:</p> <pre><code>target: sources … /sbin/mkfs.vfat …… </code></pre> <p>The second problem only occurs if you really want to write to a block device you haven't write permissions to. In this case consider what you are doing. Does it really make sense? Typically this makes only sense in a <code>make install</code> situation, and this should be executed by user <code>root</code> only, so then you'd <em>have</em> write permissions. In practice, one typically types <code>sudo make install</code> to gain root access for that installation step only.</p> <p>If, however, this is a special case, then you can add that <code>sudo</code> to your Makefile as well:</p> <pre><code>target: sources … sudo /sbin/mkfs.vfat …… </code></pre> <p>(This would lead to being asked for the password when running the Makefile.)</p> <p>And, last not least, you can use that <code>mkfs</code> to create a file, containing the newly created file system. In that case you don't need any special permissions (besides write permissions to that file you want to create:</p> <pre><code>target: sources … /sbin/mkfs.vfat -C /path/to/my/filesystem …… </code></pre>
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