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: 
    File not found: /builddir/build/BUILD/udpcast-20211207-build/BUILDROOT/usr/bin/udp-sender
    File not found: /builddir/build/BUILD/udpcast-20211207-build/BUILDROOT/usr/bin/udp-receiver

File not found: /builddir/build/BUILD/udpcast-20211207-build/BUILDROOT/usr/bin/udp-sender and File not found: /builddir/build/BUILD/udpcast-20211207-build/BUILDROOT/usr/bin/udp-receiver: These lines tell you the specific files that are missing. The path /builddir/build/BUILD/udpcast-20211207-build/BUILDROOT is crucial. This is the root directory where the package will be "installed" during the build process. It's a temporary staging area. The RPM build process expects to find the udp-sender and udp-receiver executables within this staging area, specifically in the usr/bin subdirectory.