Description of problem:
fonts-hebrew-fancy has post/postun scripts which run fc-cache
You need to add the following to you spec file:
Requires(post): fontutils
Requires(postun): fontutils

Otherwise the ordering during an install isn't correct and you'll get an error:
  Installing: fonts-hebrew-fancy           ##################### [208/640]
/var/tmp/rpm-tmp.65093: line 1: fc-cache: command not found
error: %post(fonts-hebrew-fancy-0.20051122-1.fc6.noarch) scriptlet failed, exit
status 127


Version-Release number of selected component (if applicable):
fonts-hebrew-fancy-0.20051122-1.fc6