Catalina installation

After the installation of Catalina (MacOSX 10.15), I had several problems:
- I was forced to accept that RStudio 1.3.572 had access to all the files of the computer;
- I cannot compile; I had this message:
fatal error: _stdio.h: No such file or directory
 #include <_stdio.h>

I try this
xcode-select --install

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