Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
/builddir/build/BUILD/mumble-1.4.287-build/mumble-1.4.287.src/overlay_gl/overlay.c:40:23: error: ‘bool’ cannot be defined via ‘typedef’
   40 | typedef unsigned char bool;
      |                       ^~~~
/builddir/build/BUILD/mumble-1.4.287-build/mumble-1.4.287.src/overlay_gl/overlay.c:40:23: note: ‘bool’ is a keyword with ‘-std=c23’ onwards
/builddir/build/BUILD/mumble-1.4.287-build/mumble-1.4.287.src/overlay_gl/overlay.c:40:1: warning: useless type name in empty declaration
   40 | typedef unsigned char bool;
      | ^~~~~~~
This is where the build failed.  It says that you cannot use an identifier named "bool".