how to fix??
Please do not post phone camera pictures of your computer. Take a regular screenshot and upload it to one of the many image sharing sites online, then post the URL.
The issue in question is not something that we can help you with. You’re trying to compile C code without configuring your build tools correctly. You should not ask questions about specific languages on this forum; instead, you should go to a venue where there are many people who know C/C++ well, and you should ask them how to fix it.