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: In function 'uncompresszlib':
compress.c:622:9: error: 'rc' undeclared (first use in this function)
  622 |         rc;
      |         ^~
compress.c:622:9: note: each undeclared identifier is reported only once for each function it appears in
make[3]: *** [Makefile:579: compress.lo] Error 1
This is a compilation error. The variable rc from the file compress.c on line 622 has no declared type on its first use in the function.