Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
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Snippet: 
gmake[2]: *** [vendor/CMakeFiles/libadb.dir/build.make:78: vendor/app_processes.pb.h] Error 1
Build has failed on line 78 of the `vendor/CMakeFiles/libadb.dir/build.make` while working with `vendor/app_processes.pb.h` source file, with code 1.