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: 

+ %generate_buildrequires
/var/tmp/rpm-tmp.BxlaKs: line 43: fg: no job control
error: Bad exit status from /var/tmp/rpm-tmp.BxlaKs (%pre
The error message is very cryptic but `fg: no job control` usually means that an RPM macro is not defined.