The %install section does not allow building perl-DateManip-5.40-12.src.rpm without root privileges. The error is in installing the man page. Patch to spec file will follow.
Created attachment 49464 [details] Patch to spec file to fix manpage install
Oops, sorry, my perl install must have been blasted by CPAN, the redhat perl rpm has appears to have MakeMaker modified to do the right thing with PREFIX and installman.