Note: This is NOT a duplicate of CLion C++ header files not found after macOS is updated to Catalina

CLion is reporting all header files to be missing in my lone C++ project

#include <cstdio>
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'cstdio' file not found

It was working all right until last week and the problem started appearing after I upgraded from v2024.1.5 to v2024.2.2 via JetBrains ToolBox.

What have I tried?

1. Build > Rebuild Project

2. Tools > CMake > Reload CMake Project as suggested here

3. CLion > Settings > Build, Execution, Deployment > CMake > Manage toolchains... > OK as suggested here

How can I go about fixing it?

I’m on

• CLion 2024.2.2 Build #CL-242.22855.75
• macOS Sonoma 14.6.1, Chip Apple M1 Pro, Memory 32 GB