安裝環境：
操作系統：RedHat 12.0
OpenSSL Version:openssl-0.9.8l
Download
安裝包(Linux source) : openssl-0.9.8l.tar.gz（or the latest version of openssl）
下載地址：http://www.openssl.org/source/
在linux下解壓縮下載到的安裝包，命令如下.....
tar -xzf openssl-xxx.tar.gz
Our Configuration
Install to : /usr/local/ssl
Module type : dynamically and staticly loaded modules, *.so *.a
Build Instructions
Configure
.../openssl-0.9.8l]# ./config --prefix=/usr/local/ssl-0.9.8l shared zlib-dynamic enable-camellia
--prefix=/usr/local/ssl-0.9.8l
[this is the installation location; default is '/usr/local/ssl' -- which we will symlink]
shared
[in addition to the usual static libraries, create shared libraries]
zlib-dynamic
[like "zlib", but has OpenSSL load the zlib library dynamically when needed]
enable-camellia
[enables the symmetric cipher 'Camellia' (128-bit, 192-bit, 256-bit key versions), which is now available for royalty-free use]
display guess on system made by './config'...
.../openssl-0.9.8l]# ./config -t
Build and Install
.../openssl-0.9.8l]# make depend
[step required since extra cipher was enabled]
.../openssl-0.9.8l]# make
.../openssl-0.9.8l]# make test
.../openssl-0.9.8l]# make install
Symlink
Form symlink from '/usr/local/ssl-0.9.8l' to '/usr/local/ssl'（...]代表“/usr/local/”）
...]# cd /usr/local
/usr/local]# ln -s ssl-0.9.8l ssl
Update the Run-time Linker
ld.so.cache will need to be updated with the location of the new OpenSSL shared libs: libcrypto.so.0.9.8 and libssl.so.0.9.8
Sometimes it is sufficient to just symlink or copy these two files to /lib, but we recommend you follow these instructions instead.
Edit /etc/ld.so.conf, add to paths...（修改效果如下圖1,當然也可以直接在/etc/ld.so.conf.d文件夾下再創建一個.conf文件，把/usr/local/ssl/lib拷貝到裡面，另外也可以在現有的.conf文件中添加這個路徑，反正ld.so.conf中包含了這個文件夾下的所有.conf文件）
圖1
/usr/local/ssl/lib
Update the run-time linker...
...]# ldconfig
Update the PATH
Edit /root/.bash_profile, add to PATH variable...
（若原來沒有安裝openssl的舊版本，則放在PATH中的任何位置都可以，但是記住要用冒號分隔開，而不是分號分隔，詳見後面的截圖，若想查看當前的PATH環境變量都設置了什麼，可以使用如下的命令實現：
[root@localhost local]# echo $PATH
/usr/local/ssl/bin:/usr/lib/qt-3.3/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin
）
NOTE：一般在root下直接是看不見.bash_profile（一般為隱藏文件）的，可以在該目錄下使用ls –a 命令來顯示隱藏了的文件。然後用VI或emacs編輯器來修改其中的內容。編譯完成後若要立刻看到效果，可以用命令：source .bash_profile ，若要長期起作用，需要重新登錄（當我首次安裝的時候是出現的情況是這樣的~~~
/usr/local/ssl/bin
Re-login.
[sanity check] OpenSSL
Verify that binary 'openssl' is linking against the correct ssl libraries...
[root@localhost /]# cd /usr/local
[root@localhost local]# ldd /usr/local/ssl/bin/openssl
linux-gate.so.1 => (0x00c4b000)
libssl.so.0.9.8 => /usr/local/ssl-0.9.8l/lib/libssl.so.0.9.8 (0x00d5b000)
libcrypto.so.0.9.8 => /usr/local/ssl-0.9.8l/lib/libcrypto.so.0.9.8 (0x00110000)
libdl.so.2 => /lib/libdl.so.2 (0x005b2000)
libc.so.6 => /lib/libc.so.6 (0x00447000)
/lib/ld-linux.so.2 (0x0042a000)
...]# which openssl
/usr/local/ssl/bin/openssl
...]# openssl version
OpenSSL 0.9.8l 5 Nov 2009
If another path, or an older version is shown, your system contains a previously installed OpenSSL that is first [relative to the newer openssl] in the path.
Repeate the steps in section 'Update the PATH', except place the specified location at the start of the PATH variable.(在/root/.bash_profile中將PATH設置為如下的順序，即把當前安裝上的openssl的版本放在環境變量的前面，這樣優先使用的就是新安裝的最新的版本的OpenSSL了）
圖2
Note that the older openssl, on most systems, is located under /usr/bin
The location of 'openssl' can be found with...（用下面的命令你就可以查到你的openssl的安裝目錄了~~~）
...]# which openssl
以上只是我在剛開始學習的時候的安裝過程，若有不對的地方或還有更好的方法，歡迎大家批評指正~~~
