В 5.1 запатчить/обновить бы glibc по поводу http://sourceware.org/bugzilla/show_bug.cgi?id=10282 Актуально, например, для KDE4 http://knotes.ru/2010/02/kde-sc-4-4-crashes/
glibc-6:2.11.2-alt1.M51.1 -> 5.1: * Tue Jun 08 2010 Dmitry V. Levin <ldv@altlinux> 6:2.11.2-alt1.M51.1 - Backported to M51 (closes: #23546). * Mon May 31 2010 Dmitry V. Levin <ldv@altlinux> 6:2.11.2-alt2 - Updated to glibc-2.11.2-5-g2158096. * Thu May 20 2010 Dmitry V. Levin <ldv@altlinux> 6:2.11.2-alt1 - Updated to glibc-2.11.2. * Wed Mar 17 2010 Dmitry V. Levin <ldv@altlinux> 6:2.11.1-alt4 - nss_nis: Reverted part of commit glibc-2.11-64-ga682a1b to fix regression (closes: #23173). - nsswitch.conf: Disabled nis/nis+ by default. * Thu Mar 11 2010 Dmitry V. Levin <ldv@altlinux> 6:2.11.1-alt3 - Updated to glibc-2.11.1-4-g11c19d3. - Updated crypt_blowfish to 1.0.4. - Updated binutils versioned build requirement. * Wed Jan 13 2010 Dmitry V. Levin <ldv@altlinux> 6:2.11.1-alt2 - glibc-core: Added rtld(GNU_UNIQUE) to provides list. * Fri Jan 08 2010 Dmitry V. Levin <ldv@altlinux> 6:2.11.1-alt1 - Updated to glibc-2.11.1 + fedora/glibc-2.11.1-1. * Fri Jan 08 2010 Dmitry V. Levin <ldv@altlinux> 6:2.10.2-alt1 - Updated to glibc-2.10.2-1-g313f9d1. * Tue Oct 27 2009 Kirill A. Shutemov <kas@altlinux> 6:2.10.1-alt8 - Fix build with binutils >= 2.20