Description of problem:
(A bit long)
For review request (bug 431692) I tried to rebuild
the same srpm (libdstr-20080124-1.fc8.src.rpm) on koji,
on dist-f9 and dist-f8-updates-candidate.
The srpm can be found on
http://mtasaka.fedorapeople.org/Review_request/libdstr/libdstr-20080124-1.fc8.src.rpm

The results of the rebuild are:
for dist-f9:
http://koji.fedoraproject.org/koji/taskinfo?taskID=399004
for dist-f8:
http://koji.fedoraproject.org/koji/taskinfo?taskID=398997

The issue is that for dist-f9, the build.log shows:
http://koji.fedoraproject.org/koji/getfile?taskID=399006&name=build.log
--------------------------------------------------------------------
Processing files: libdstr-devel-20080124-1.fc9
Requires(rpmlib): rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
Requires: libdstr.so.2()(64bit)
--------------------------------------------------------------------
Here "Requires: libdstr = 20080124-1.fc9" is not shown.
On the other hand, on dist-f8-updates-candidate, build.log shows:
--------------------------------------------------------------------
Processing files: libdstr-devel-20080124-1.fc8
Requires(rpmlib): rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
Requires: libdstr = 20080124-1.fc8 libdstr.so.2()(64bit)
---------------------------------------------------------------------


Version-Release number of selected component (if applicable):
rpm-build-4.4.2.3-0.1.rc1
(some rpms which "rpm" depends on are related??)

How reproducible:
100%

Steps to Reproduce:
1. Try rpmbuild on rawhide and watch build log output.
2.
3.
  
Actual results:
Manual dependency written in spec file is not shown on
build log for subpackages.