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: 
compress.c:618:1: warning: data definition has no type or storage class
  618 | zero = 0;
      | ^~~~
compress.c:618:1: error: type defaults to 'int' in declaration of 'zero' [-Wimplicit-int]
The build is failing due to a compiler error related to a implicit ‘int’ declaration.