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注意，安装之后请同步src源代码，重新编译。因为release是8月份就做好的，好像有安全补丁了，同理，ports也要重新编译。

详情看http://www.openbsd.org/52.html

Some highlights:

GNOME 3.4.2
KDE 3.5.10
Xfce 4.10
MySQL 5.1.63
PostgreSQL 9.1.4
Postfix 2.9.3
OpenLDAP 2.3.43 and 2.4.31
Mozilla Firefox 3.5.19, 3.6.28 and 13.0.1
Mozilla Thunderbird 13.0.1
GHC 7.0.4
LibreOffice 3.5.5.3
Emacs 21.4, 22.3 and 23.4
Vim 7.3.154
PHP 5.2.17 and 5.3.14
Python 2.5.4, 2.7.3 and 3.2.3
Ruby 1.8.7.370 and 1.9.3.194
Tcl/Tk 8.5.11
Jdk 1.7
Mono 2.10.9
Chromium 20.0.1132.57
Groff 1.21
Go 1.0.2
GCC 4.6.3 and 4.7.1
LLVM/Clang 3.1
Lua 5.1.5 and 5.2.1

As usual, steady improvements in manual pages and other documentation.

The system includes the following major components from outside suppliers:

Xenocara (based on X.Org 7.7 with xserver 1.12.2 + patches, freetype 2.4.10, fontconfig 2.8.0, Mesa 7.10.3, xterm 279, xkeyboard-config 2.6 and more)
Gcc 4.2.1 (+patches) and 2.95.3 (+ patches)
Perl 5.12.2 (+ patches)
Our improved and secured version of Apache 1.3, with SSL/TLS and DSO support
Nginx 1.2.2 (+ patches)
OpenSSL 1.0.0f (+ patches)
SQLite 3.7.13 (+ patches)
Sendmail 8.14.5, with libmilter
Bind 9.4.2-P2 (+ patches)
NSD 3.2.11
Lynx 2.8.7rel.2 with HTTPS and IPv6 support (+ patches)
Sudo 1.7.2p8
Ncurses 5.7
Heimdal 0.7.2 (+ patches)
Arla 0.35.7
Binutils 2.15 (+ patches)
Gdb 6.3 (+ patches)
Less 444 (+ patches)
Awk Aug 10, 2011 version

The most significant change in this release is the replacement of the user-level uthreads by kernel-level rthreads, allowing multithreaded programs to utilize multiple CPUs/cores.

貌似对多线程和多核 CPU 的支持增强了。

5.2的 banner 风格大变！

话说补丁就没有二进制的么？我最怕升级后重新编译，pkg_add -u 蛮好的。
LLVM/Clang 非x86平台也用不了。我还是好好学习GCC 4.2.1了。