php-pecl-apc ships both a 32-bit and 64-bit module: yum list available --noplugins --showduplicates php-pecl-apc Available Packages php-pecl-apc.i686 3.1.10-1.fc17 fedora php-pecl-apc.x86_64 3.1.10-1.fc17 fedora Although PHP in F17 has shipped with both 32 and 64-bit packages, updates are only published for the x86_64 arch: yum list available --noplugins --showduplicates php Available Packages php.i686 5.4.1-1.fc17 fedora php.x86_64 5.4.1-1.fc17 fedora php.x86_64 5.4.3-1.fc17 updates php-pecl-apc should drop the 32-bit packages or php must resume shipping both 32 and 64 bits libs.
Today, no more issue: # LANG=C yum list available --showduplicates php php-pecl-apc Loaded plugins: auto-update-debuginfo, langpacks, presto, refresh-packagekit Available Packages php.i686 5.4.1-1.fc17 fedora php.x86_64 5.4.1-1.fc17 fedora php.i686 5.4.6-2.fc17 updates php.x86_64 5.4.6-2.fc17 updates php-pecl-apc.i686 3.1.10-1.fc17 fedora php-pecl-apc.x86_64 3.1.10-1.fc17 fedora php-pecl-apc.i686 3.1.13-1.fc17 updates php-pecl-apc.x86_64 3.1.13-1.fc17 updates