fish /fish/redhat/rawhide-ppc # yum update
Setting up Update Process
Setting up repositories
audit                     100% |=========================|  951 B    00:00
development               100% |=========================| 1.1 kB    00:00
livna-stable              100% |=========================|  951 B    00:00
fc3-updates               100% |=========================|  951 B    00:00
base                      100% |=========================|  951 B    00:00
extras-devel              100% |=========================| 1.1 kB    00:00
livna-testing             100% |=========================|  951 B    00:00
Reading repository metadata in from local files
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package kakasi-devel.ppc 0:2.3.4-20 set to be updated
---> Package perl-Text-Kakasi.ppc 0:2.04-1 set to be updated
---> Package glibc-profile.ppc 0:2.3.5-10 set to be updated
---> Package recode.ppc 0:3.6-17 set to be updated
---> Package SDL_mixer-devel.ppc 0:1.2.5-7 set to be updated
---> Package glibc-common.ppc 0:2.3.5-10 set to be updated
---> Package glibc-headers.ppc 0:2.3.5-10 set to be updated
---> Package flim.noarch 0:1.14.7-3 set to be updated
---> Package isdn4k-utils.ppc 0:3.2-28 set to be updated
---> Package isdn4k-utils-vboxgetty.ppc 0:3.2-28 set to be updated
---> Package namazu-cgi.ppc 0:2.0.14-3 set to be updated
---> Package gnu-crypto-jce-jdk1.4.noarch 0:2.0.1-1jpp_5fc set to be updated
---> Package namazu.ppc 0:2.0.14-3 set to be updated
---> Package xisdnload.ppc 0:3.2-28 set to be updated
---> Package SDL_image.ppc 0:1.2.3-9 set to be updated
---> Package xboard.ppc 0:4.2.7-9 set to be updated
---> Package gnome-applets.ppc 1:2.10.1-9 set to be updated
---> Package alsa-lib-devel.ppc 0:1.0.9rc4-2 set to be updated
---> Package mew-common.ppc 0:4.2-1 set to be updated
---> Package glibc.ppc 0:2.3.5-10 set to be updated
---> Package namazu-devel.ppc 0:2.0.14-3 set to be updated
---> Package xemacs-sumo-info.noarch 0:20050505-3 set to be updated
---> Package gnu-crypto-sasl-jdk1.4.noarch 0:2.0.1-1jpp_5fc set to be updated
---> Package libtabe-devel.ppc 0:0.2.6-14 set to be updated
---> Package recode-devel.ppc 0:3.6-17 set to be updated
---> Package kernel-doc.noarch 0:2.6.11-1.1366_FC4 set to be updated
---> Package mew.ppc 0:4.2-1 set to be updated
---> Package w3m-el-common.ppc 0:1.4.4-1 set to be updated
---> Package glibc-utils.ppc 0:2.3.5-10 set to be updated
---> Package screen.ppc 0:4.0.2-9 set to be updated
---> Package nfs-utils.ppc 0:1.0.7-8 set to be updated
---> Package alsa-lib.ppc 0:1.0.9rc4-2 set to be updated
---> Package SDL_image-devel.ppc 0:1.2.3-9 set to be updated
---> Package gnu-crypto.noarch 0:2.0.1-1jpp_5fc set to be updated
---> Package w3m-el.ppc 0:1.4.4-1 set to be updated
---> Package mew-xemacs.ppc 0:4.2-1 set to be updated
---> Package libtabe.ppc 0:0.2.6-14 set to be updated
---> Package kakasi-dict.ppc 0:2.3.4-20 set to be updated
---> Package isdn4k-utils-devel.ppc 0:3.2-28 set to be updated
---> Package nscd.ppc 0:2.3.5-10 set to be updated
---> Package kernel-devel.ppc 0:2.6.11-1.1366_FC4 set to be installed
---> Package SDL_mixer.ppc 0:1.2.5-7 set to be updated
---> Package jessie.noarch 0:1.0.0-8 set to be updated
---> Package kakasi.ppc 0:2.3.4-20 set to be updated
---> Package glibc-devel.ppc 0:2.3.5-10 set to be updated
---> Package iptraf.ppc 0:2.7.0-15 set to be updated
--> Running transaction check
--> Processing Dependency: glibc-headers = 2.3.5-9 for package: glibc-devel
--> Processing Dependency: glibc-common = 2.3.5-9 for package: glibc
Traceback (most recent call last):
  File "/usr/bin/yum", line 15, in ?
    yummain.main(sys.argv[1:])
  File "/usr/share/yum-cli/yummain.py", line 113, in main
    (result, resultmsgs) = base.buildTransaction()
  File "__init__.py", line 319, in buildTransaction
  File "depsolve.py", line 210, in resolveDeps
  File "depsolve.py", line 341, in _processReq
  File "depsolve.py", line 453, in _requiringFromInstalled
  File "sqlitesack.py", line 413, in returnNewestByNameArch
repomd.mdErrors.PackageSackError: No Package Matching glibc.ppc64

It lies. There really is a PPC64 glibc package available.