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: 
rdppm.c: In function 'start_input_ppm':
rdppm.c:427:51: warning: implicit declaration of function 'MAX' [-Wimplicit-function-declaration]
                                   (size_t)(((long)MAX(maxval, 255) + 1L) *
                                                   ^~~

This is cause of the error - warning shows that function/macro used here is not defined